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

We investigated the minimum achievable bit error rate of discriminating binary coherent states by homodyne measurements with the help of arbitrary ancilla states coupled via beam splitters. We took into account arbitrary pure ancillary states those were updated in real-time by those partial measurem...

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Bibliographic Details
Published inarXiv.org
Main Authors Yoshida, Yuhsuke, Takeoka, Masahiro, Sasaki, Masahide
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 22.03.2010
Subjects
Beam splitters
Bit error rate
Codes
Data replication
Error analysis
Error detection
Invariants
Physics - Quantum Physics
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Summary:We investigated the minimum achievable bit error rate of discriminating binary coherent states by homodyne measurements with the help of arbitrary ancilla states coupled via beam splitters. We took into account arbitrary pure ancillary states those were updated in real-time by those partial measurements and classical feedforward operations where the partial measurements were made by homodyne detections with a common fixed phase. It was shown that the minimum bit error rate of the system was invariant under these operations. We also discussed how generalize the homodyne detection beyond the scheme which made the bit error rate invariant.
ISSN:2331-8422
DOI:10.48550/arxiv.1003.4055