Enhancing the sensitivity of nonlinearity sensors through homodyne detection in dissipatively coupled systems
arXiv:2207.09261 · doi:10.1103/PhysRevA.107.013709
Abstract
In this manuscript, we propose a new sensing mechanism to enhance the sensitivity of a quantum system to nonlinearities by homodyning the amplitude quadrature of the cavity field. The system consists of two dissipatively coupled cavity modes, one of which is subject to single- and two-photon drives. In the regime of low two-photon driving strength, the spectrum of the system acquires a real spectral singularity. We find that this singularity is very sensitive to the two-photon drive and nonlinearity of the system, and compared to the previous nonlinearity sensor, the proposed sensor achieves an unprecedented sensitivity around the singularity point. Moreover, the scheme is robust against fabrication imperfections. This work would open a new avenue for quantum sensors, which could find applications in many fields, such as the precise measurement and quantum metrology.
10 pages, 6 figures
References in corpus (14)
- Charge insensitive qubit design derived from the Cooper pair box
- Making Sense of Non-Hermitian Hamiltonians
- The physics of exceptional points
- PT-Symmetric Phonon Laser
- Confining the state of light to a quantum manifold by engineered two-photon loss
- Nonreciprocal Photon Transmission and Amplification via Reservoir Engineering
- Opto-mechanical transducers for long-distance quantum communication
- Magnon Kerr effect in a strongly coupled cavity-magnon system
- Unconventional Singularity in Anti-Parity-Time Symmetric Cavity Magnonics
- Bifurcation diagram and pattern formation in superconducting wires with electric currents
- Enhanced sensing of weak anharmonicities through coherences in dissipatively coupled anti-PT symmetric systems
- Travelling photons mediated interactions between a magnon mode and a cavity photon mode
- Detecting the effects of quantum gravity with exceptional points in optomechanical sensors
- Emergent non-Hermitian localization phenomena in the synthetic space of zero-dimensional bosonic systems