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Tomography of a Feedback Measurement with Photon Detection
- Source :
- Izumi, S, Neergaard-Nielsen, J S & Andersen, U L 2020, ' Tomography of a Feedback Measurement with Photon Detection ', Physical Review Letters, vol. 124, no. 7, 070502 . https://doi.org/10.1103/physrevlett.124.070502, Izumi, S, Neergaard-Nielsen, J S & Andersen, U L 2021, Tomography of a feedback measurement with photon detection . in Proceedings of 2021 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) . IEEE, 2021 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, Munich, Bavaria, Germany, 21/06/2021 . https://doi.org/10.1109/CLEO/Europe-EQEC52157.2021.9542297
- Publication Year :
- 2020
- Publisher :
- American Physical Society (APS), 2020.
-
Abstract
- Measurement and discrimination of quantum states are essential tasks in quantum information processing. A measurement strategy consisting of photon detection preceded by a displacement operation, that is actively feedback-controlled depending on the photon detection outcomes, is known to be a powerful measurement technique for quantum state discrimination [1] . In our work, we experimentally develop such a feedback measurement with photon detection and characterize its positive operator valued measure (POVM) via quantum detector tomography using coherent states. Quantum detector tomography has been demonstrated for various types of static measurements [3] , but not before for a dynamically updated measurement. As a potential application of the feedback measurement for quantum state discrimination, we analyze the performance of our measurement for the discrimination of the two orthogonal superpositions of vacuum and single photon states $| \pm \rangle = (|0\rangle \pm |1\rangle )/\sqrt 2 $ , which are the conjugate basis states of the optical single-rail qubit.
- Subjects :
- Physics
Quantum Physics
Photon
Computer science
Operator (physics)
Detector
Measure (physics)
FOS: Physical sciences
General Physics and Astronomy
01 natural sciences
POVM
Quantum nonlocality
Superposition principle
Quantum state
Quantum mechanics
Qubit
0103 physical sciences
Electronic engineering
Coherent states
Quantum information
Quantum Physics (quant-ph)
010306 general physics
Quantum information science
Realization (systems)
Subjects
Details
- ISSN :
- 10797114 and 00319007
- Volume :
- 124
- Database :
- OpenAIRE
- Journal :
- Physical Review Letters
- Accession number :
- edsair.doi.dedup.....5c48af493cc29aa16542a52ac4135110