Squeezing-symmetry of the balanced homodyne detector

Giacomo Mauro D’Ariano

R. Loudon

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.

Samuel L. Braunstein, David D. Crouch

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.

W. Vogel, Jens Grabow

Y. Ben-Aryeh