Phase-controlled quantum optomechanics

Mohamed Amazioug, Mohammed Daoud A

Lingchao Li, Jian‐Qi Zhang

The optomechanics shows a great potential in quantum control and precise measurement due to appropriate mechanical control. Here we theoretically study the quantum phase transition in a hybrid atom-optomechanical cavity with an external force. Our study shows, in the thermodynamic limit, the critical value of quantum phase transition between the normal phase and super-radiant phase can be controlled and modified by the external force via the tunable frequency of optomechanics, then a force dependent quantum phase transition can be achieved in our system. Moreover, this force dependent quantum phase transition can be employed to detect the external force variation. In addition, our numerical simulations illustrate the sensitivity of the external force measurement can be improved by the squeezing properties of the quantum phase transition.

Max Ludwig

S. Höfer, Klemens Hammerer

Xin‐You Lü, Ying Wu, J. R. Johansson +3 more

We investigate the nonlinear interaction between a squeezed cavity mode and a mechanical mode in an optomechanical system (OMS) that allows us to selectively obtain either a radiation-pressure coupling or a parametric-amplification process. The squeezing of the cavity mode can enhance the interaction strength into the single-photon strong-coupling regime, even when the OMS is originally in the weak-coupling regime. Moreover, the noise of the squeezed mode can be suppressed completely by introducing a broadband-squeezed vacuum environment that is phase matched with the parametric amplification that squeezes the cavity mode. This proposal offers an alternative approach to control the OMS using a squeezed cavity mode, which should allow single-photon quantum processes to be implemented with currently available optomechanical technology. Potential applications range from engineering single-photon sources to nonclassical phonon states.

M.J. Rudd, P.H. Kim, C. A. Potts +4 more

One of the most exciting topics in quantum technology is the development of optomechanical interfaces, to link quantum devices in hybrid systems. Efforts to bridge the radio-infrared frequency gap, to network superconducting qubits over optical fiber, have benefited from piezoelectric optomechanics, but an alternative is to use the magnetic component of electromagnetic waves to control an optomechanical resonator. This work shows that such magnetic control of a torsional resonator is phase coherent, a prerequisite for quantum operation, and that such phase control can be used for classical information transmission via phase-shift keying.