Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Optical Fiber Communication Conference

Auto-compensating Quantum Cryptosystem using Homodyne Detection

Qing Xu, M. B. Costa e Silva, Philippe B. Gallion, Francisco Javier Mendieta

Published Feb 1, 2008• 8 citations
Publisher

Abstract

We implement an experimental quantum cryptosystem using standard 1550nm channel devices with auto-compensation for phase instabilities in which balanced homodyne detection employs a time-multiplexed strong reference. We use a dual-threshold to improve QBER.
DOI
10.1109/ofc.2008.4528203

Related papers

Dual-threshold Receiver for 1550nm Homodyne QPSK Quantum Key Distribution System

Qing Xu, Manuel Sabban, Philippe B. Gallion +1 more

We present a dual-threshold balanced homodyne receiver for QPSK QKD system in which the strong reference is time-multiplexed with the weak signal pulses in optical fiber, we also report its experimental BER and post-detection efficiency.

Coherent Optical Technologies and Applications (COTA)•Jan 1, 2008•1 citation

Homodyne detection of weak coherent optical pulse: Applications to quantum cryptography

Qing Xu, Manuel Sabban, Philippe B. Gallion

Abstract We propose a quantum key distribution system using balanced homodyne detection, in which strong reference pulses are time‐multiplexed with weak signal pulses by means of fiber interferometer. We use a dual‐threshold decision scheme for postdetection to improve the system performance in terms of BER, with a trade‐off in effective key generation rate. We conduct experimental measurements at 64 km SMF fiber at 1550 nm wavelength, and we prove that the system security can also be enhanced with properly selected threshold parameters. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1934–1939, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24471

Microwave and Optical Technology Letters•May 13, 2009•2 citations

Quantum key distribution system using dual-threshold homodyne detection

Qing Xu, Manuel Sabban, Philippe B. Gallion +1 more

In this work we present the principles of a flexible quantum key distribution (QKD) system using quadrature-phase-shift-keying (QPSK) base and symbol encoding and dual-threshold balanced homodyne detection (BHD) scheme. We give its security proofs and we compare its performance experimentally with a photon counting detection scheme.

RIVF International Conference on Computing and Communication Technologies (RIVF)•Jul 1, 2008•5 citations

Dual-Threshold Balanced Homodyne Detection at 1550 nm Optical Fiber Quantum Key Distribution System

Qing Xu, Manuel Sabban, M. B. Costa e Silva +2 more

We present a flexible quantum key distribution (QKD) system implementation using quadrature phase-shift keying (QPSK) encoding. Two detection techniques are implemented and compared: a photon counting detection scheme using single photon avalanche diodes (SPAD) and a dual-threshold balanced homodyne detection (BHD) using standard PIN diodes in which the weak signal is time-multiplexed with a strong reference. The interferometer instability and the system phase fluctuations are compensated by an optoelectronic feedback loop that allows an automatic continuous operation. We compare the QKD system performance for both schemes in terms of BER and key generation efficiency. Finally, we analyze the BHD QKD system security under the potential individual intercept-resend attack and the intermediate-base attack.

Journal of Lightwave Technology•Apr 18, 2009•9 citations

Phase estimation using homodyne detection for continuous variable quantum key distribution

Mi Zou, Yingqiu Mao, Teng‐Yun Chen

In order to ensure the security of the local oscillator (LO) in continuous variable quantum key distribution (CV-QKD), the LO in CV-QKD based on the local LO (LLO) scheme no longer passes through the quantum channel. For the LLO scheme using homodyne detection, two orthogonal quadratures of reference pulse can only be measured sequentially, which, as a result, each signal pulse should be accompanied by a pair of identical reference pulses. However, due to the phase shift between two adjacent pulses, it is difficult to prepare dual reference pulses with the same phase relative to the LO. In this paper, we propose an improved method to get around this difficulty, which is demonstrated experimentally for a transmitter and a receiver connected by a 50 km single mode fiber. The phase noise measured in the experiment is 2.0×10−3rad2, which is comparable to the recent experimental results using heterodyne detection. This method simplifies the preparation of phase reference pulses and removes the obstacles for the application of homodyne detection in the LLO scheme. In addition, this method can also be used for the compensation of quadrature imbalance in heterodyne detection, then the performance of heterodyne detection can be improved.

Journal of Applied Physics•Aug 9, 2019•6 citations

Towards Quantum Key Distribution System using Homodyne Detection with Differential Time-Multiplexed Reference

Qing Xu, Marcia Costa e Silva, Jean‐Luc Danger +4 more

In this work we present the principles and experimental demonstration of a BB84 quantum key distribution (QKD) one way system using fainted pulses and a quadrature phase-shift-keying (QPSK) format including a time- multiplexed unmodulated carrier reference at Alice's end, and a differential homodyne reception at Bob's end. We also describe the secure electronics interface subsystem concept for the interaction with upper layers in an IP application.

RIVF International Conference on Computing and Communication Technologies (RIVF)•Mar 1, 2007•8 citations
Abstract We propose a quantum key distribution system using balanced homodyne detection, in which strong reference pulses are time‐multiplexed with weak signal pulses by means of fiber interferometer. We use a dual‐threshold decision scheme for postdetection to improve the system performance in terms of BER, with a trade‐off in effective key generation rate. We conduct experimental measurements at 64 km SMF fiber at 1550 nm wavelength, and we prove that the system security can also be enhanced with properly selected threshold parameters. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1934–1939, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24471
We present a flexible quantum key distribution (QKD) system implementation using quadrature phase-shift keying (QPSK) encoding. Two detection techniques are implemented and compared: a photon counting detection scheme using single photon avalanche diodes (SPAD) and a dual-threshold balanced homodyne detection (BHD) using standard PIN diodes in which the weak signal is time-multiplexed with a strong reference. The interferometer instability and the system phase fluctuations are compensated by an optoelectronic feedback loop that allows an automatic continuous operation. We compare the QKD system performance for both schemes in terms of BER and key generation efficiency. Finally, we analyze the BHD QKD system security under the potential individual intercept-resend attack and the intermediate-base attack.
In order to ensure the security of the local oscillator (LO) in continuous variable quantum key distribution (CV-QKD), the LO in CV-QKD based on the local LO (LLO) scheme no longer passes through the quantum channel. For the LLO scheme using homodyne detection, two orthogonal quadratures of reference pulse can only be measured sequentially, which, as a result, each signal pulse should be accompanied by a pair of identical reference pulses. However, due to the phase shift between two adjacent pulses, it is difficult to prepare dual reference pulses with the same phase relative to the LO. In this paper, we propose an improved method to get around this difficulty, which is demonstrated experimentally for a transmitter and a receiver connected by a 50 km single mode fiber. The phase noise measured in the experiment is 2.0×10−3rad2, which is comparable to the recent experimental results using heterodyne detection. This method simplifies the preparation of phase reference pulses and removes the obstacles for the application of homodyne detection in the LLO scheme. In addition, this method can also be used for the compensation of quadrature imbalance in heterodyne detection, then the performance of heterodyne detection can be improved.