21 results on '"BOUDA, JAN"'
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2. General measurements with limited resources and their application to quantum unambiguous state discrimination
- Author
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Reitzner, Daniel and Bouda, Jan
- Subjects
Quantum Physics - Abstract
In this report, we present a framework for implementing an arbitrary $n$-outcome generalized quantum measurement (POVM) on an $m$-qubit register as a sequence of two-outcome measurements requiring only single ancillary qubit. Our procedure offers a particular construction for the two-outcome partial measurements which can be composed into a full implementation of the measurement on any gate architecture. This implementation in general requires classical feedback; we present specific cases when this is not the case. We apply this framework on the unambiguous state discrimination and analyze possible strategies. In the simplest case, it gives the same construction as is known, if we opt for performing conclusiveness measurement first. However, it also offers possibility of performing measurement for one of the state outcomes first, leaving conclusiveness measurement for later. This shows flexibility of presented framework and opens possibilities for further optimization. We present discussion also on biased qubit case as well as general case of unambiguous quantum state discrimination in higher dimension., Comment: 27 pages, 8 figures
- Published
- 2020
- Full Text
- View/download PDF
3. Improving the Hadamard extractor
- Author
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Bouda, Jan, Pivoluska, Matej, and Plesch, Martin
- Published
- 2012
- Full Text
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4. Efecto de la aplicación de prostaglandina F2α en las primeras horas posparto sobre las concentraciones séricas de calcio en vacas lecheras.
- Author
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Salgado Hernández, Eligio Gabriel, Bouda, Jan, Cecilio A., Adolfo Aparicio, Doubek, Jaroslav, and Velásquez Forero, Francisco Hernany
- Abstract
La hipocalcemia subclínica ocurre con frecuencia en las vacas lecheras y las predispone a patologías reproductivas. La prostaglandina F2α (PGF2α) mejora la salud uterina e incrementa la concentración de calcitriol en otras especies. El objetivo fue evaluar el efecto de la administración de cloprostenol sódico, un análogo de PGF2α sobre la concentración sérica de calcio, metabolitos de la vitamina D y variables reproductivas. Se utilizaron 80 vacas Holstein multíparas, las cuales se dividieron aleatoriamente en dos grupos. A las vacas del grupo 1 (n = 38) se les administró 500 μg de cloprostenol sódico vía IM en la primera hora posparto y una segunda aplicación 48 horas después. El grupo 2 fue el testigo (n = 42). En 10 animales de cada grupo se tomaron muestras de sangre 1, 3, 12, 24 y 48 horas después del parto, y a los 7 días posparto. Se registró la incidencia de retención de placenta, metritis, endometritis y número de días abiertos. Las concentraciones séricas de calcio (Ca), fósforo (P), magnesio (Mg), calcidiol y calcitriol se evaluaron mediante un análisis de varianza para un diseño de medidas repetidas. La concentración sérica de Ca aumentó al día 7 en los animales tratados con cloprostenol sódico, comparados con los animales del grupo testigo. El tratamiento con PGFα aumentó la concentración sérica de calcio al séptimo día posparto y redujo el número de días abiertos, lo que podría ser de utilidad para prevenir hipocalcemia subclínica y problemas reproductivos posparto. [ABSTRACT FROM AUTHOR]
- Published
- 2014
- Full Text
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5. SPECIAL CAI SECTION DEVOTED TO MEMICS '11: PREFACE.
- Author
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Kotásek, Zdenĕk, Sekanina, Lukáš, Vojnar, Tomáš, Bouda, Jan, and Černá, Ivana
- Subjects
COMPUTER science ,ENGINEERING - Abstract
An introduction to the journal is presented in which the editor discusses reports within the issue on topics that are selected from the 7th International Doctoral Workshop on Mathematical and Engineering Methods in Computer Science.
- Published
- 2012
6. QUANTUM COMMUNICATION BETWEEN ANONYMOUS SENDER AND ANONYMOUS RECEIVER IN THE PRESENCE OF STRONG ADVERSARY.
- Author
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BOUDA, JAN and ŠPROJCAR, JOSEF
- Subjects
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QUANTUM communication , *CRYPTOGRAPHY , *DATA transmission systems , *DENIAL of service attacks , *COMPUTER security , *INFORMATION processing , *COMPUTER network protocols - Abstract
While many scenarios of anonymous communication can be solved by various famous classical techniques including mix nets or dining cryptographers (DC), an abundant amount of anonymous tasks remains open. In this paper, we present a solution to one such task. Our protocol serves as a private communication channel for quantum messages while ensuring that both the sender and the receiver stay anonymous in a set of all parties. Our protocol is a continuation of our previous work on anonymous transmission of quantum information. The protocol does not require trusted parties, and is secure against an active adversary. It can also withstand denial of service attacks. The protocol exhibits an advantage of quantum resources over classical because no classical solution is known (in the same security settings). Entanglement swapping technique is used to create "symmetry" in the protocol, which makes it very transparent and easier to analyze. The security analysis we present is heavily based on our previous work on quantum anonymous communication. The task we implement is also a nice illustration of a cryptographic task where two parties in a multi-party protocol can be dishonest at the same time, but are not cooperating. [ABSTRACT FROM AUTHOR]
- Published
- 2011
- Full Text
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7. Nonmalleable encryption of quantum information.
- Author
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Ambainis, Andris, Bouda, Jan, and Winter, Andreas
- Subjects
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QUANTUM theory , *DATA encryption , *DATA protection , *MATHEMATICAL analysis , *EQUATIONS - Abstract
We introduce the notion of nonmalleability of a quantum state encryption scheme (in dimension d): in addition to the requirement that an adversary cannot learn information about the state, here we demand that no controlled modification of the encrypted state can be effected. We show that such a scheme is equivalent to a unitary 2-design [Dankert, et al., e-print arXiv:quant-ph/0606161], as opposed to normal encryption which is a unitary 1-design. Our other main results include a new proof of the lower bound of (d2-1)2+1 on the number of unitaries in a 2-design [Gross, et al., J. Math. Phys. 48, 052104 (2007)], which lends itself to a generalization to approximate 2-design. Furthermore, while in prime power dimension there is a unitary 2-design with ≤d5 elements, we show that there are always approximate 2-designs with O(ε-2d4 log d) elements. [ABSTRACT FROM AUTHOR]
- Published
- 2009
- Full Text
- View/download PDF
8. Efecto de la administración de sales de calcio y precursores de glucosa sobre calcio sérico y cuerpos cetónicos en vacas lecheras posparto.
- Author
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Salgado Hernández, Eligio Gabriel, Bouda, Jan, García, Jorge Ávila, and Navarro Hernández, Jaime Alonso
- Abstract
La hipocalcemia subclínica y la cetosis subclínica se presentan en la mayoría de las vacas lecheras en los primeros días posparto, esto último aumenta el riesgo de otras enfermedades y disminuye la producción láctea. El objetivo de este trabajo fue evaluar el efecto de la administración de sales de calcio y precursores de glucosa sobre la concentración sérica de calcio y de cuerpos cetónicos en leche de vacas lecheras multíparas posparto. Se utilizaron 16 vacas de la raza Holstein de dos a cuatro partos, con condición corporal entre 3.25 a 3.75 puntos, las cuales se distribuyeron aleatoriamente en tres grupos. De 1 a 2 h después del parto, las vacas del Grupo 1 (n = 5) recibieron 700 g de propionato de calcio disuelto en 10 L de agua mediante una sonda esofágica y una bomba manual. A las vacas del Grupo 2 (n = 6) se les administró, vía intravenosa, 500 mL de una solución de borogluconato de calcio a 23% y 500 mL de propilenglicol vía oral. Las vacas del Grupo 3 (testigo n = 5) no recibieron tratamiento. Se obtuvieron muestras de sangre de 1 a 2 h después del parto (antes del tratamiento) y luego se tomaron otras dos muestras a las 12 y 24 h, en las que se determinó la concentración sérica de calcio. A los tres, siete y 10 días posparto se determinó la concentración de β-hidroxibutirato en leche. Los resultados fueron analizados por medio de análisis de varianza multivariado para un diseño de mediciones repetidas. No se encontraron diferencias significativas en la concentración sérica de calcio entre los tratamientos (F2,13 =1.0488, P = 0.3782). En la producción de leche, a los 10 y 60 días posparto, se encontró diferencia significativa entre los tratamientos (F2,13 = 4.1338, P = 0.0408). Se encontró diferencia significativa entre la proporción de casos de cetosis entre los grupos 1 y 2 (Ji cuadrada = 5.238; P = 0.0455). La administración oral de 700 g de propionato de calcio 1 a 2 h posparto no aumenta la concentración sérica de calcio, reduce la frecuencia de cetosis subclínica y puede aumentar la producción de leche. [ABSTRACT FROM AUTHOR]
- Published
- 2009
9. Effect of postpartum administration of calcium salts and glucose precursors on serum calcium and ketone bodies in dairy cows.
- Author
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Salgado Hernández, Eligio Gabriel, Bouda, Jan, García, Jorge Ávila, and Navarro Hernández, Jaime Alonso
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HYPOCALCEMIA , *ACETONEMIA , *COW diseases , *MILK yield , *CALCIUM salts , *GLUCOSE - Abstract
Subclinical hypocalcemia and ketosis are common diseases in mostly dairy cows in the first days postpartum, increasing the risk for other diseases and decreasing milk production. The objective of this study was to evaluate the effect of postpartum administration of calcium salts and glucose precursors on the concentration of serum calcium and ketone bodies in milk of multiparous dairy cows. Sixteen Holstein cows with two to four calvings and body condition from 3.25 to 3.75 points were utilized and randomized into three groups. Cows of the Group 1 (n = 5) received 700 g of calcium propionate diluted in 10 L of water by a esophageal pump system between 1 and 2 h after calving. Cows of the Group 2 (n = 6) were treated intravenously with 500 mL of calcium borogluconate solution (23%) and 500 mL of propylene glycol as an oral drench. The control Group (n = 5) did not receive any treatment. Blood samples were collected 1 to 2 h after calving (before treatment) and two more samples 12 and 24 h after calving for determination of calcium in serum. Levels of β-hydroxybutyrate were assessed in milk at days 3, 7 and 10 postpartum. The results were analyzed using the multivariate analysis of variance for repeated measures. There were no significant differences in serum concentration of calcium between treatments (F2,13 = 1.0488, P = 0.3782). A significant difference in milk production was found among treatments (F2,13 = 4.1338, P = 0.0408) at days 10 and 60 postpartum. The significant difference in the proportion of cases of subclinical ketosis was registered between groups 1 and 2 ( chi square = 5.238; P = 0.0455). Oral administration of 700 g of calcium propionate 1 to 2 h postpartum, does not increase serum calcium concentration, reduces frequency of subclinical ketosis and can increase milk production. [ABSTRACT FROM AUTHOR]
- Published
- 2009
10. Alterations of serum and urine analytes in diabetic dogs: 30 cases report.
- Author
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Herrera, Samuel Genaro Jardón, Vargas, Rosa Luz Mondragón, Ortuño, Luis Enrique García, and Bouda, Jan
- Subjects
DIAGNOSIS of diabetes ,DOG diseases ,SERUM ,URINALYSIS - Abstract
The objective of this study was to describe alterations in blood clinical biochemistry and urinalysis which enable to establish the diagnosis of diabetes mellitus in dogs. Thirty cases of diabetic dogs were analyzed. The inclusion criteria were the following: hyperglycemia above 14 mmol/L, glucosuria, urine density above 1.014 and polyuria-polydipsia. Dogs of different breeds, from 7 months to 14 years of age and both genders (73.3% females and 26.7% males) were studied. The most frequent biochemical alterations in blood serum were: hyperglycemia (100%), increased urea (46%) and creatinine (13%), increase of enzyme activities ALT (50%), AST (46%), alkaline phosphatase (56%), amylase (20%), creatine kinase (66%); hypercholesterolemia (66%), hyperglobulinemia (33%), hyperphosphoremia (33%), hyperkaliemia (43%), hyponatremia (16%), hypochloremia (46%), hypobicarbonatemia (50%), increased anion gap (53%), increased strong ion difference (30%), increased serum osmolality (23%) and hypertriglyceridemia (50%). The urine density was between 1.015 and 1.064, mean value of urine glucose 49 mmol/L. Urine ketone bodies were detected in 10% of all cases. Described alterations in clinical biochemistry are important for the diagnosis, clinical care, and prognosis of dogs with diabetes mellitus. [ABSTRACT FROM AUTHOR]
- Published
- 2008
11. Alteraciones de analitos séricos y de orina en perros diabéticos: Informe de 30 casos.
- Author
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Herrera, Samuel Genaro Jardón, Vargas, Rosa Luz Mondragón, Ortuño, Luis Enrique García, and Bouda, Jan
- Abstract
Copyright of Veterinaria México is the property of Facultad de Medicina Veterinaria y Zootecnia UNAM and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2008
12. Alterations in hemogram and selected biochemical analytes in diabetic dogs: retrospective study in 40 dogs.
- Author
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Jardón Herrera, Samuel Genaro, Vargas, Rosa Luz Mondragón, and Bouda, Jan
- Subjects
DIABETES ,DOG diseases ,BLOOD cell count ,URINALYSIS ,HYPERGLYCEMIA ,GLYCOSURIA ,ANEMIA ,LEUCOCYTOSIS - Abstract
The objective of this study was to describe changes in hemogram and selected biochemical analytes in blood and urine of 40 dogs with diabetes mellitus. The inclusion criteria were the following: hyperglycemia above 14 mmol/L, glucosuria and urine specific gravity above 1.015. Dogs of different breeds, from 4 to 14 years of age and both genders (30 females and 10 males) were studied. The analyzed diagnostic procedures were: packed cell volume, hemoglobin, red blood cell count, white blood cell count and differential cell count, Wintrobe index: mean corpuscular volume and mean corpuscular hemoglobin concentration, plasma proteins, globulins, serum glucose, alkaline phosphatase (AP), glucosuria and specific gravity. Anemia was present in 47.5% of the cases, nonregenerative normocytic-normochromic anemia in 37.5%, nonregenerative normocytic-hyperchromic anemia in 5.0% and nonregenerative microcytic-normochromic anemia in 5.0%. Leukocytosis was present in 15.0% cases, leukopenia in 10.0%, neutrophilia in 47.5%, left shift in 30.0%, lymphocytosis in 5.0%, lymphopenia in 27.5%, monocytosis in 5.0%, eosinopenia in 42.50% and eosinophilia in 10.0%. Only 10.0% of all dogs did not presented hemogram abnormalities. Alterations such as anemia, secondary inflammation and stress, are frequent in this pathology; for which they should be considered for clinical care, prognosis and to evaluate diabetic dog's evolution. [ABSTRACT FROM AUTHOR]
- Published
- 2007
13. Alteraciones en el hemograma y analitos bioquímicos selectos en perros diabéticos: estudio retrospectivo en 40 perros.
- Author
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Jardón Herrera, Samuel Genaro, Vargas, Rosa Luz Mondragón, and Bouda, Jan
- Abstract
Copyright of Veterinaria México is the property of Facultad de Medicina Veterinaria y Zootecnia UNAM and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2007
14. Clinical-pathological diagnosis of ethylene glycol poisoning: A case report.
- Author
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García-Ortuño, Luis Enrique, Bouda, Jan, Jardón Herrera, Genaro, and Morales Salinas, Elizabeth
- Subjects
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PATHOLOGY , *ETHYLENE , *POISONING , *THERAPEUTICS , *ETHYLENE glycol - Abstract
The objective of this study was to present the most important clinical-pathological findings of ethylene glycol poisoning for early diagnosis and adequate treatment. A clinical case of a female dog which consumed a toxic amount of ethylene glycol and presented tachycardia, tachypnea, seizures and vomiting, is described blood samples were taken for determination of acid-base equilibrium, hemogram and serum chemistry. The laboratory changes were: partially compensated metabolic acidosis, increased anion gap, relative erythrocytosis, leukogram response to stress, renal hyperazotemia and monohydrate calcium oxalate crystals in urine sediment. Calcium oxalate crystals in renal tubules and brain observed by histopathology confirmed ethylene glycol poisoning. The adequate use of laboratory tests and the early diagnosis, as well as the early treatment, determine the prognosis of the animal. [ABSTRACT FROM AUTHOR]
- Published
- 2006
15. Diagnóstico clínico-patológico en intoxicación con etilenglicol: Informe de un caso.
- Author
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García-Ortuño, Luis Enrique, Bouda, Jan, Jardón Herrera, Genaro, and Morales Salinas, Elizabeth
- Abstract
El objetivo del presente estudio fue dar a conocer los hallazgos clínico-patológicos más importantes de la intoxicación con etilenglicol, con el fin de diagnosticarla con prontitud y tomar decisiones terapéuticas adecuadas. Se tomó como referencia el caso clínico de una perra, la cual consumió una cantidad tóxica de etilenglicol y presentó taquicardia, taquipnea, convulsiones y vómito. Se tomaron muestras de sangre para evaluar equilibrio ácido-base, hemograma y bioquímica sanguínea. Los cambios fueron: acidosis metabólica parcialmente compensada, elevación importante de ácidos orgánicos, eritrocitosis relativa, leucograma de estrés, hiperazotemia renal y cristales de oxalato de calcio monohidratado en sedimento urinario. Mediante histopatología se observaron cristales de oxalato de calcio en túbulos renales y encéfalo, y se confirmó el diagnóstico de intoxicación con etilenglicol. El diagnóstico oportuno con el uso adecuado de las pruebas de laboratorio, así como la terapia inmediata, determina el pronóstico en el animal. [ABSTRACT FROM AUTHOR]
- Published
- 2006
16. Valores bioquímicos selectos en plasma sanguíneo de avestruces de diferentes edades y sexo.
- Author
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Bouda, Jan, Quiroz-Rocha, Gerardo F., Sánchez Ramírez, Ezequiel, Esquivel Peña, Jaime, and Dávalos Flores, José Luis
- Abstract
Se determinaron valores bioquímicos selectos en el plasma de sangre venosa de 45 avestruces (Struthio camelus) clínicamente sanos de diferentes edades y sexo a 2 220 msnm. Los animales fueron divididos en cuatro grupos por edad, el grupo de adultos fue subdividido en dos grupos por sexo. El grupo 1 (n = 10) eran pollos de edad promedio de 26.5 d; el grupo 2 (n = 10) incluyó pollos de 70.0 d de edad; el grupo 3 (n = 8) eran aves de 232.4 d; el grupo 4 (n = 17) estuvo formado por diez hembras y siete machos de seis años de edad. La dieta fue una mezcla a base de heno de alfalfa picado, sorgo, harina de soya, con suplemento de vitaminas y minerales y con el agua de bebida se proporcionaron ad libitum. En todas las muestras de plasma sanguíneo se determinaron 17 analitos bioquímicos. Entre las diferentes edades de avestruces se encontraron diferencias significativas (P < 0.05) en los valores de glucosa, ácido úrico, proteína total, albúmina, globulinas, Ca2+, P inorgánico, colesterol, ALT, AST, creatina cinasa, fosfatasa alcalina y amilasa. Al comparar hembras y machos adultos se encontraron diferencias significativas (P < 0.05) en los valores de proteína total, albúmina, globulinas, Ca2+, Mg2+, P inorgánico. Los valores bioquímicos determinados en este estudio se pueden considerar como referencia útil para el diagnóstico de enfermedades en esta especie en las diferentes edades. [ABSTRACT FROM AUTHOR]
- Published
- 2004
17. Selected biochemical values in blood plasma of ostriches of different age and sex.
- Author
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Bouda, Jan, Quiroz-Rocha, Gerardo F., Ramírez, Ezequiel Sánchez, Peña, Jaime Esquivel, and Dávalos Flores, José Luis
- Subjects
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OSTRICHES , *BIOMARKERS , *BLOOD plasma , *BIOCHEMISTRY , *RATITES - Abstract
Selected biochemical values were determined in venous blood plasma from 45 clinically healthy ostriches (Struthio camelus) of different age and sex at an altitude 2 200 m above sea level. Animals were divided by age into 4 groups and the group of adults was divided by sex into 2 subgroups. Group 1 included chickens (n =10) aged 26.5 d; Group 2 included 70-day-old chickens (n =10); Group 3 were juvenile birds (n =8) aged 232.4 d; Group 4 was formed by 10 females and 7 males (n =17), aged 6 years old. The diet was a mixture composed of chopped alfalfa hay, sorghum and soybean meal, supplemented with vitamins and minerals. Drinking water and diet were provided ad libitum. In all blood samples 17 biochemical analytes were determined. Significant (P < 0.05) age effect was found in the values for glucose, uric acid, total protein, albumin, globulins, Ca2+, inorganic P, cholesterol, ALT, AST, creatine kinase, alkaline phosphatase and amylase. There was also a significant (P < 0.05) sex difference in values for total protein, albumin, globulins, Ca2+, Mg2+ and inorganic P. Blood biochemical values determined in this study can be considered reference data for disease diagnosis in ostriches of different ages. [ABSTRACT FROM AUTHOR]
- Published
- 2004
18. ENCRYPTION OF QUANTUM INFORMATION.
- Author
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Bouda, Jan and Bužzek, Vladimí R
- Subjects
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DATA encryption , *QUANTUM computers , *CRYPTOGRAPHY , *INFORMATION storage & retrieval systems - Abstract
We study in detail the problem of encryption of quantum information. We present an attack on a private quantum channel (PQC) which applies when partial classical description of a ciphertext is known (the so-called known-ciphertext attack) and we show how this situation can be avoided. The quantum analogue of the known plaintext attack is also discussed. We determine how correlations between quantum systems can be encrypted and we conclude that two PQCs on the subsystems form a PQC on the whole composite system. Finally, some applications of the PQC are suggested and a security of a noisy channel is discussed. [ABSTRACT FROM AUTHOR]
- Published
- 2003
- Full Text
- View/download PDF
19. Security of the private quantum channel.
- Author
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Bouda, Jan and Buǽek, Vladimír
- Subjects
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QUANTUM theory , *DATA encryption - Abstract
We extensively discuss the problem of encryption of quantum information. We present an attack on the private quantum channel which applies when partial classical description of the cipher text is known (the known-ciphertext attack) and show how to avoid this situation. The quantum analogue of the known-plaintext attack is also discussed. [ABSTRACT FROM AUTHOR]
- Published
- 2003
- Full Text
- View/download PDF
20. Entanglement swapping between multi-qudit systems.
- Author
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Bouda, Jan and Buzek, Vladim�r
- Published
- 2001
- Full Text
- View/download PDF
21. Impacto de la administración y la calidad del calostro sobre los niveles de inmunoglobulinas séricas en becerros.
- Author
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Quiroz Rocha, Gerardo F., Bouda, Jan, Nuñez Ochoa, Luis, Medina Cruz, Mario, and Yabuta Osorio, Adolfo K.
- Published
- 1998
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