Performance of quantum data transmission systems in the presence of thermal noise

In the literature the performance of quantum data transmission systems is usually evaluated in the absence of thermal noise. A more realistic approach taking into account the thermal noise is intrinsically more difficult because it requires dealing with Glauber coherent states in an infinite-dimensi...

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Bibliographic Details
Published in:IEEE transactions on communications 2010-02, Vol.58 (2), p.623-630
Main Authors: Cariolaro, G., Pierobon, G.
Format: Article
Language:English
Subjects:
Applied sciences
Approximation
Data communication
Data transmission
Detectors
Error probability
Exact sciences and technology
geometrically uniform states
Information, signal and communications theory
Life members
Mathematical analysis
Modulation, demodulation
Optical noise
Optical transmitters
Optimization
Phase shift keying
phase shift keying (PSK)
QAM
Quadrature amplitude modulation
Quantum detection
Quantum mechanics
Signal and communications theory
square root measurement
Systems, networks and services of telecommunications
Tasks
Telecommunications
Telecommunications and information theory
Thermal noise
Transmission and modulation (techniques and equipments)
Working environment noise
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Summary:In the literature the performance of quantum data transmission systems is usually evaluated in the absence of thermal noise. A more realistic approach taking into account the thermal noise is intrinsically more difficult because it requires dealing with Glauber coherent states in an infinite-dimensional space. In particular, the exact evaluation of the optimal measurement operators is a very difficult task, and numerical approximation is unavoidable. The paper faces the problem by approximating the P-representation of the noisy quantum states with a large but finite numbers of terms and applying to them the square root measurement (SRM) approach. Comparisons with cases where the exact solution are known show that the SRM approach gives quite accurate results. As application, the performance of quadrature amplitude modulation (QAM) and phase shift keying (PSK) systems is considered. In spite of the fact that the SRM approach is not optimal and overestimates the error probability, also in these cases the quantum detection maintains its superiority with respect to the classical homodyne detection.
ISSN:0090-6778
1558-0857
DOI:10.1109/TCOMM.2010.02.080013