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

Quantum Electronics and Laser Science Conference

Fundamental limits to observations of squeezing by balanced homodyne detection

Samuel L. Braunstein, David D. Crouch

Published May 12, 1991• 0 citations
OpenAlex

Abstract

We show that there is a fundamental limit to observing squeezing by balanced homo dyne detection. This is important because the balanced homodyne detector is the prototypical device for the measurement of squeezing.

Related papers

Influence of the Non-Ideal Balanced Homodyne Detection on the Measured Squeezing Degree

靳晓丽 Jin Xiaoli, 苏静 Su Jing, 郑耀辉 Zheng Yaohui

Acta Optica Sinica•Jan 1, 2016•1 citation

Fundamental limits to observations of squeezing via balanced homodyne detection

Samuel L. Braunstein, David D. Crouch

A photodetector's electronic bandwidth is the frequency range over which beats between different frequencies in the input can be observed in the output. The output of a balanced homodyne detector, the prototypical device for detecting squeezed light, consists of beats between a signal to be measured and a local oscillator. Beats between the signal and quantum local-oscillator fluctuations lead to noise that degrades the observed squeezing. Through wide-band calculations, we show that this noise contains contributions from the entire signal bandwidth, even when this bandwidth is orders of magnitude larger than the detector's electronic bandwidth. This allows us to place an upper limit on the total power that can enter the detector's signal port (both signal and extraneous light) within the detector's optical bandwidth in order for a given level of squeezing to be observable.

Physical Review A•Jan 1, 1991•10 citations

Squeezing-symmetry of the balanced homodyne detector

Giacomo Mauro D’Ariano

Springer eBooks•Apr 7, 2008•1 citation

Balanced Homodyne Detector With Independent Phase Control and Noise Detection Branches

JinRong Wang, Wenhui Zhang, Long Tian +4 more

Squeezed state light is a fundamental resource for many quantum optics experiments. Important applications like quantum-enhanced magnetometer and quantum key distribution, require the squeezing level as high as possible. In balanced homodyne detection, the detector output is directly proportional to the noise of the squeezed beam. The detected quadrature is dependent on the relative phase between the squeezed beam and local oscillator. Here, we present a balanced homodyne detector (BHD) with independent phase control and noise detection branches. The independence between the phase control and noise detection branches is experimentally verified, the two branches are independently optimized according to the practical requirements. With the BHD, a bright squeezed light at 1550 nm with quantum noise reduction of 10.3 dB is directly detected. After stabilizing the relative phase between the squeezed states and local oscillator by the phase locking branch of the BHD, the fluctuation of the noise suppression is ±0.2 dB by 1-h testing time.

IEEE Access•Jan 1, 2019•9 citations

Adaptive Phase Estimation with Squeezed Vacuum States near the Quantum Limit

Marco A. Rodríguez-García, F. E. Becerra

We present a protocol for homodyne adaptive optical phase estimation with squeezed vacuum states. The protocol utilizes the complete detection record of the homo-dyne, and approaches the quantum limit for a wide range of phases.

Quantum 2.0 Conference and Exhibition•Jan 1, 2023•0 citations

Balanced Homodyne Detection with High Common Mode Rejection Ratio for Squeezed Light Detection

靳晓丽 JIN Xiao-li, 苏静 Su Jing, 郑耀辉 Zheng Yaohui

Acta Sinica Quantum Optica•Jan 1, 2016•1 citation
A photodetector's electronic bandwidth is the frequency range over which beats between different frequencies in the input can be observed in the output. The output of a balanced homodyne detector, the prototypical device for detecting squeezed light, consists of beats between a signal to be measured and a local oscillator. Beats between the signal and quantum local-oscillator fluctuations lead to noise that degrades the observed squeezing. Through wide-band calculations, we show that this noise contains contributions from the entire signal bandwidth, even when this bandwidth is orders of magnitude larger than the detector's electronic bandwidth. This allows us to place an upper limit on the total power that can enter the detector's signal port (both signal and extraneous light) within the detector's optical bandwidth in order for a given level of squeezing to be observable.
Squeezed state light is a fundamental resource for many quantum optics experiments. Important applications like quantum-enhanced magnetometer and quantum key distribution, require the squeezing level as high as possible. In balanced homodyne detection, the detector output is directly proportional to the noise of the squeezed beam. The detected quadrature is dependent on the relative phase between the squeezed beam and local oscillator. Here, we present a balanced homodyne detector (BHD) with independent phase control and noise detection branches. The independence between the phase control and noise detection branches is experimentally verified, the two branches are independently optimized according to the practical requirements. With the BHD, a bright squeezed light at 1550 nm with quantum noise reduction of 10.3 dB is directly detected. After stabilizing the relative phase between the squeezed states and local oscillator by the phase locking branch of the BHD, the fluctuation of the noise suppression is ±0.2 dB by 1-h testing time.