Optomechanical source

Nobuyuki Matsumoto

Laure Mercier de Lépinay, Erno Damskägg, Caspar F. Ockeloen-Korppi +1 more

Directional amplification is essential in superconducting quantum information experiments, to measure small signals without disturbing potentially fragile sources. While several classes of amplifiers provide directionality and good noise figures, they generally have low levels of saturation. Optomechanical amplifiers would not suffer from this limitation. This work demonstrates a microwave directional amplifier, based on the directional interference effect between two optomechanical amplifiers. The study reveals this amplifier's robustness to typical nonidealities, and allows the formulation of guidelines for designing multimode optomechanical devices for applied or fundamental physics.

Zhi‐Bo Feng, Jian‐Qi Zhang

Correlated photons are essential sources for quantum information processing. We propose a practical scheme to generate pairs of correlated photons in a controllable fashion from a double-cavity optomechanical system, where the variable optomechanical coupling strength makes it possible to tune the photon correlation at our will. The key operation is based on the repulsive or attractive interaction between the two photons intermediated by the mechanical resonator. The present protocol could provide a potential approach to coherent control of the photon correlation using the optomechanical cavity.

Juliette Monsel

Thomas Purdy, Karen E. Grutter, Kartik A. Srinivasan +3 more

We present methods to measure optical quantum correlations arising from an optomechanical interaction even when large classical noise sources are present. We demonstrate quantum-backaction-noise-calibrated Brownian motion thermometry as a metrological application of quantum optomechanics.