Invariance of the bit error rate in the ancilla-assisted homodyne detection

Journal Article · Mon Nov 15 00:00:00 EST 2010 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.82.052303· OSTI ID:21528582

Yoshida, Yuhsuke; Takeoka, Masahiro; Sasaki, Masahide ^[1]

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1. Quantum Information Technology Group, National Institute of Information and Communications Technology, 4-2-1 Nukui-kitamachi, Koganei, Tokyo 184-8795 (Japan)

We investigate the minimum achievable bit error rate of the discrimination of binary coherent states with the help of arbitrary ancillary states. We adopt homodyne measurement with a common phase of the local oscillator and classical feedforward control. After one ancillary state is measured, its outcome is referred to the preparation of the next ancillary state and the tuning of the next mixing with the signal. It is shown that the minimum bit error rate of the system is invariant under the following operations: feedforward control, deformations, and introduction of any ancillary state. We also discuss the possible generalization of the homodyne detection scheme.

• OSTI ID: 21528582
• Journal Information: Physical Review. A, Vol. 82, Issue 5; Other Information: DOI: 10.1103/PhysRevA.82.052303; (c) 2010 The American Physical Society; ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
97 MATHEMATICAL METHODS AND COMPUTING
ANNIHILATION OPERATORS
CONTROL
DETECTION
EIGENSTATES
OSCILLATORS
SIGNALS
TUNING
ELECTRONIC EQUIPMENT
EQUIPMENT
MATHEMATICAL OPERATORS
QUANTUM OPERATORS