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5 results on '"Thomas Mason"'

1. Interferometric Single-Shot Parity Measurement in an InAs-Al Hybrid Device

Author

Aghaee, Morteza, Ramirez, Alejandro Alcaraz, Alam, Zulfi, Ali, Rizwan, Andrzejczuk, Mariusz, Antipov, Andrey, Astafev, Mikhail, Barzegar, Amin, Bauer, Bela, Becker, Jonathan, Bhaskar, Umesh Kumar, Bocharov, Alex, Boddapati, Srini, Bohn, David, Bommer, Jouri, Bourdet, Leo, Bousquet, Arnaud, Boutin, Samuel, Casparis, Lucas, Chapman, Benjamin James, Chatoor, Sohail, Christensen, Anna Wulff, Chua, Cassandra, Codd, Patrick, Cole, William, Cooper, Paul, Corsetti, Fabiano, Cui, Ajuan, Dalpasso, Paolo, Dehollain, Juan Pablo, de Lange, Gijs, de Moor, Michiel, Ekefjärd, Andreas, Dandachi, Tareq El, Saldaña, Juan Carlos Estrada, Fallahi, Saeed, Galletti, Luca, Gardner, Geoff, Govender, Deshan, Griggio, Flavio, Grigoryan, Ruben, Grijalva, Sebastian, Gronin, Sergei, Gukelberger, Jan, Hamdast, Marzie, Hamze, Firas, Hansen, Esben Bork, Heedt, Sebastian, Heidarnia, Zahra, Zamorano, Jesús Herranz, Ho, Samantha, Holgaard, Laurens, Hornibrook, John, Indrapiromkul, Jinnapat, Ingerslev, Henrik, Ivancevic, Lovro, Jensen, Thomas, Jhoja, Jaspreet, Jones, Jeffrey, Kalashnikov, Konstantin V., Kallaher, Ray, Kalra, Rachpon, Karimi, Farhad, Karzig, Torsten, King, Evelyn, Kloster, Maren Elisabeth, Knapp, Christina, Kocon, Dariusz, Koski, Jonne, Kostamo, Pasi, Kumar, Mahesh, Laeven, Tom, Larsen, Thorvald, Lee, Jason, Lee, Kyunghoon, Leum, Grant, Li, Kongyi, Lindemann, Tyler, Looij, Matthew, Love, Julie, Lucas, Marijn, Lutchyn, Roman, Madsen, Morten Hannibal, Madulid, Nash, Malmros, Albert, Manfra, Michael, Mantri, Devashish, Markussen, Signe Brynold, Martinez, Esteban, Mattila, Marco, McNeil, Robert, Mei, Antonio B., Mishmash, Ryan V., Mohandas, Gopakumar, Mollgaard, Christian, Morgan, Trevor, Moussa, George, Nayak, Chetan, Nielsen, Jens Hedegaard, Nielsen, Jens Munk, Nielsen, William Hvidtfelt Padkær, Nijholt, Bas, Nystrom, Mike, O'Farrell, Eoin, Ohki, Thomas, Otani, Keita, Wütz, Brian Paquelet, Pauka, Sebastian, Petersson, Karl, Petit, Luca, Pikulin, Dima, Prawiroatmodjo, Guen, Preiss, Frank, Morejon, Eduardo Puchol, Rajpalke, Mohana, Ranta, Craig, Rasmussen, Katrine, Razmadze, David, Reentila, Outi, Reilly, David J., Ren, Yuan, Reneris, Ken, Rouse, Richard, Sadovskyy, Ivan, Sainiemi, Lauri, Sanlorenzo, Irene, Schmidgall, Emma, Sfiligoj, Cristina, Shah, Mustafeez Bashir, Simoes, Kevin, Singh, Shilpi, Sinha, Sarat, Soerensen, Thomas, Sohr, Patrick, Stankevic, Tomas, Stek, Lieuwe, Stuppard, Eric, Suominen, Henri, Suter, Judith, Teicher, Sam, Thiyagarajah, Nivetha, Tholapi, Raj, Thomas, Mason, Toomey, Emily, Tracy, Josh, Turley, Michelle, Upadhyay, Shivendra, Urban, Ivan, Van Hoogdalem, Kevin, Van Woerkom, David J., Viazmitinov, Dmitrii V., Vogel, Dominik, Watson, John, Webster, Alex, Weston, Joseph, Winkler, Georg W., Xu, Di, Yang, Chung Kai, Yucelen, Emrah, Zeisel, Roland, Zheng, Guoji, and Zilke, Justin

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

The fusion of non-Abelian anyons or topological defects is a fundamental operation in measurement-only topological quantum computation. In topological superconductors, this operation amounts to a determination of the shared fermion parity of Majorana zero modes. As a step towards this, we implement a single-shot interferometric measurement of fermion parity in indium arsenide-aluminum heterostructures with a gate-defined nanowire. The interferometer is formed by tunnel-coupling the proximitized nanowire to quantum dots. The nanowire causes a state-dependent shift of these quantum dots' quantum capacitance of up to 1 fF. Our quantum capacitance measurements show flux h/2e-periodic bimodality with a signal-to-noise ratio of 1 in 3.7 $\mu$s at optimal flux values. From the time traces of the quantum capacitance measurements, we extract a dwell time in the two associated states that is longer than 1 ms at in-plane magnetic fields of approximately 2 T. These results are consistent with a measurement of the fermion parity encoded in a pair of Majorana zero modes that are separated by approximately 3 $\mu$m and subjected to a low rate of poisoning by non-equilibrium quasiparticles. The large capacitance shift and long poisoning time enable a parity measurement error probability of 1%., Comment: Added data on a second measurement of device A and a measurement of device B, expanded discussion of a trivial scenario. Refs added, author list updated

Published
2024

2. InAs-Al Hybrid Devices Passing the Topological Gap Protocol

Author

Aghaee, Morteza, Akkala, Arun, Alam, Zulfi, Ali, Rizwan, Ramirez, Alejandro Alcaraz, Andrzejczuk, Mariusz, Antipov, Andrey E, Aseev, Pavel, Astafev, Mikhail, Bauer, Bela, Becker, Jonathan, Boddapati, Srini, Boekhout, Frenk, Bommer, Jouri, Hansen, Esben Bork, Bosma, Tom, Bourdet, Leo, Boutin, Samuel, Caroff, Philippe, Casparis, Lucas, Cassidy, Maja, Christensen, Anna Wulf, Clay, Noah, Cole, William S, Corsetti, Fabiano, Cui, Ajuan, Dalampiras, Paschalis, Dokania, Anand, de Lange, Gijs, de Moor, Michiel, Saldaña, Juan Carlos Estrada, Fallahi, Saeed, Fathabad, Zahra Heidarnia, Gamble, John, Gardner, Geoff, Govender, Deshan, Griggio, Flavio, Grigoryan, Ruben, Gronin, Sergei, Gukelberger, Jan, Heedt, Sebastian, Zamorano, Jesús Herranz, Ho, Samantha, Holgaard, Ulrik Laurens, Nielsen, William Hvidtfelt Padkær, Ingerslev, Henrik, Krogstrup, Peter Jeppesen, Johansson, Linda, Jones, Jeffrey, Kallaher, Ray, Karimi, Farhad, Karzig, Torsten, King, Evelyn, Kloster, Maren Elisabeth, Knapp, Christina, Kocon, Dariusz, Koski, Jonne, Kostamo, Pasi, Kumar, Mahesh, Laeven, Tom, Larsen, Thorvald, Li, Kongyi, Lindemann, Tyler, Love, Julie, Lutchyn, Roman, Manfra, Michael, Memisevic, Elvedin, Nayak, Chetan, Nijholt, Bas, Madsen, Morten Hannibal, Markussen, Signe, Martinez, Esteban, McNeil, Robert, Mullally, Andrew, Nielsen, Jens, Nurmohamed, Anne, O'Farrell, Eoin, Otani, Keita, Pauka, Sebastian, Petersson, Karl, Petit, Luca, Pikulin, Dima, Preiss, Frank, Perez, Marina Quintero, Rasmussen, Katrine, Rajpalke, Mohana, Razmadze, Davydas, Reentila, Outi, Reilly, David, Rouse, Richard, Sadovskyy, Ivan, Sainiemi, Lauri, Schreppler, Sydney, Sidorkin, Vadim, Singh, Amrita, Singh, Shilpi, Sinha, Sarat, Sohr, Patrick, Stankevič, Tomaš, Stek, Lieuwe, Suominen, Henri, Suter, Judith, Svidenko, Vicky, Teicher, Sam, Temuerhan, Mine, Thiyagarajah, Nivetha, Tholapi, Raj, Thomas, Mason, Toomey, Emily, Upadhyay, Shivendra, Urban, Ivan, Vaitiekėnas, Saulius, Van Hoogdalem, Kevin, Viazmitinov, Dmitrii V., Waddy, Steven, Van Woerkom, David, Vogel, Dominik, Watson, John, Weston, Joseph, Winkler, Georg W., Yang, Chung Kai, Yau, Sean, Yi, Daniel, Yucelen, Emrah, Webster, Alex, Zeisel, Roland, and Zhao, Ruichen

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

We present measurements and simulations of semiconductor-superconductor heterostructure devices that are consistent with the observation of topological superconductivity and Majorana zero modes. The devices are fabricated from high-mobility two-dimensional electron gases in which quasi-one-dimensional wires are defined by electrostatic gates. These devices enable measurements of local and non-local transport properties and have been optimized via extensive simulations to ensure robustness against non-uniformity and disorder. Our main result is that several devices, fabricated according to the design's engineering specifications, have passed the topological gap protocol defined in Pikulin et al. [arXiv:2103.12217]. This protocol is a stringent test composed of a sequence of three-terminal local and non-local transport measurements performed while varying the magnetic field, semiconductor electron density, and junction transparencies. Passing the protocol indicates a high probability of detection of a topological phase hosting Majorana zero modes as determined by large-scale disorder simulations. Our experimental results are consistent with a quantum phase transition into a topological superconducting phase that extends over several hundred millitesla in magnetic field and several millivolts in gate voltage, corresponding to approximately one hundred micro-electron-volts in Zeeman energy and chemical potential in the semiconducting wire. These regions feature a closing and re-opening of the bulk gap, with simultaneous zero-bias conductance peaks at both ends of the devices that withstand changes in the junction transparencies. The extracted maximum topological gaps in our devices are 20-60 $\mu$eV. This demonstration is a prerequisite for experiments involving fusion and braiding of Majorana zero modes., Comment: Final version

Published
2022
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3. Protocol to identify a topological superconducting phase in a three-terminal device

Author

Pikulin, Dmitry I., van Heck, Bernard, Karzig, Torsten, Martinez, Esteban A., Nijholt, Bas, Laeven, Tom, Winkler, Georg W., Watson, John D., Heedt, Sebastian, Temurhan, Mine, Svidenko, Vicky, Lutchyn, Roman M., Thomas, Mason, de Lange, Gijs, Casparis, Lucas, and Nayak, Chetan

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics, Condensed Matter - Superconductivity
Abstract

We develop a protocol to determine the presence and extent of a topological phase with Majorana zero modes in a hybrid superconductor-semiconductor device. The protocol is based on conductance measurements in a three-terminal device with two normal leads and one superconducting lead. A radio-frequency technique acts as a proxy for the measurement of local conductance, allowing a rapid, systematic scan of the large experimental phase space of the device. Majorana zero modes cause zero bias conductance peaks at each end of the wire, so we identify promising regions of the phase space by filtering for this condition. To validate the presence of a topological phase, a subsequent measurement of the non-local conductance in these regions is used to detect a topological transition via the closing and reopening of the bulk energy gap. We define data analysis routines that allow for an automated and unbiased execution of the protocol. Our protocol is designed to screen out false positives, especially trivial Andreev bound states that mimic Majorana zero modes in local conductance. We apply the protocol to several examples of simulated data illustrating the detection of topological phases and the screening of false positives., Comment: 28 pages, 18 figures, 1 table

Published
2021

4. The Child Abuse Reporting Law. Protecting Children Becomes a Broader Community Responsibility. 2d Edition.

Author

North Carolina Univ., Chapel Hill. Institute of Government. and Thomas, Mason P.

Abstract

North Carolina's Child Abuse Reporting Law makes all citizens legally responsible for reporting incidents of child abuse and neglect. Professionals, such as doctors and teachers, must also give their professional opinions as to the nature, extent, and causes of the damaged child's condition. The basic purpose of the law is to identify children at risk because of parental or caretaker abuse or neglect and then to provide protective services for these children. North Carolina's county social services departments have the primary responsibility for implementing the law; citizens must report incidents of abuse or neglect to these departments. The law provides protection against civil and criminal liability for any one reporting such incidents in good faith. This booklet summarizes the Child Abuse Reporting Law in layman's language. It also contains the text of the law, as well as of state statutes setting criminal sanctions for child abuse. (Author/DS)

Published
1976

5. Kids and Cops. Law Enforecement Services for Children in North Carolina. Interim Report.

Author

North Carolina Univ., Chapel Hill. Institute of Government., Thomas, Mason P., and Hogue, L. Lynn

Abstract

This book is designed to meet the practical needs of law enforcement officers working with children in North Carolina. Chapters on the law and children's rights, changes in the law enforcement officer's role, legal procedures applicable to juveniles, the use of juvenile detention resources, and child abuse and neglect contain historical background information, as well as analyze relevant statute and court law. The authors examine the rationale behind the laws pertaining to delinquent, undisciplined, dependent, and neglected children. They emphasize that present-day law is intended to reform delinquent and undisciplined children and to protect those whose families fail to provide protection and safety. The book also includes the text of selected general statutes relating to children in North Carolina. (Author/DS)

Published
1974

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