Adaptive generalized measurement for unambiguous state discrimination of
quaternary phase-shift-keying coherent states
- URL: http://arxiv.org/abs/2009.02558v3
- Date: Thu, 15 Apr 2021 08:09:53 GMT
- Title: Adaptive generalized measurement for unambiguous state discrimination of
quaternary phase-shift-keying coherent states
- Authors: Shuro Izumi, Jonas S. Neergaard-Nielsen and Ulrik L. Andersen
- Abstract summary: We experimentally demonstrate an adaptive generalized measurement that can unambiguously discriminate the quaternary phase-shift-keying coherent states.
Our results show a clear improvement of both a probability of conclusive results and a ratio of erroneous decision caused by unavoidable experimental imperfections over conventional static generalized measurements.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Generalized quantum measurements identifying non-orthogonal states without
ambiguity often play an indispensable role in various quantum applications. For
such unambiguous state discrimination scenario, we have a finite probability of
obtaining inconclusive results and minimizing the probability of inconclusive
results is of particular importance. In this paper, we experimentally
demonstrate an adaptive generalized measurement that can unambiguously
discriminate the quaternary phase-shift-keying coherent states with a
near-optimal performance. Our scheme is composed of displacement operations,
single photon detections and adaptive control of the displacements dependent on
a history of photon detection outcomes. Our experimental results show a clear
improvement of both a probability of conclusive results and a ratio of
erroneous decision caused by unavoidable experimental imperfections over
conventional static generalized measurements.
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