Phase-Locked Homodyne Measurement of Quasiprobability Q Function and Detection of Information-Carrying Weak-Coherent States

ABSTRACT We present an eight‐port homodyne receiver implemented in free space technology for detection of weak coherent states that carry binary information. For transmitted power economy, we use suppressed‐carrier modulation, therefore, we have implemented an optical Costas‐loop‐type carrier synchr...

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Bibliographic Details
Published in:Microwave and optical technology letters 2013-10, Vol.55 (10), p.2431-2437
Main Authors: Garcia, Edith, Mendieta, Francisco J., Lopez, Josue A., Alvarez, Eduardo, Arvizu, Arturo, Gallion, Philippe
Format: Article
Language:English
Subjects:
Coherence
Cost engineering
Economics
eight-port homodyne detector
Microwaves
Modulation
optical Costas loop
Q function measurement
Quadratures
quantum key distribution
Receivers
Reproduction
weak coherent states
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Summary:ABSTRACT We present an eight‐port homodyne receiver implemented in free space technology for detection of weak coherent states that carry binary information. For transmitted power economy, we use suppressed‐carrier modulation, therefore, we have implemented an optical Costas‐loop‐type carrier synchronizer. We obtain the quasiprobability Q function from the in‐phase and quadrature observables that are simultaneously measured. Statistical results for the quadrature components are presented. We perform measurements for the bit error rate and the mutual information between transmitter–receiver. The results show that the proposed setup is suitable in quantum communications and continuous variable quantum key distribution systems. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2431–2437, 2013
ISSN:0895-2477
1098-2760
DOI:10.1002/mop.27844