Photon-assisted entanglement and squeezing generation and decoherence suppression via a quadratic optomechanical coupling

Abstract

Entanglement and quantum squeezing have wide applications in quantum technologies due to their non-classical characteristics. Here we study entanglement and quantum squeezing in an open spin-optomechanical system, in which a Rabi model (a spin coupled to the mechanical oscillator) is coupled to an ancillary cavity field via a quadratic optomechanical coupling. We find that their performances can be significantly modulated via the photon of the ancillary cavity, which comes from photon-dependent spin-oscillator coupling and detuning. Specifically, a fully switchable spinoscillator entanglement can be achieved, meanwhile a strong mechanical squeezing is also realized. Moreover, we study the environment-induced decoherence and dissipation, and find that they can be mitigated by increasing the number of photons. This work provides an effective way to manipulate entanglement and quantum squeezing and to suppress decoherence in the cavity quantum electrodynamics with a quadratic optomechanics.

The biosensor based on electrochemical dynamics of fermentation in yeast Saccharomyces cerevisiae

“…Separation of cells between different thermo-insulating nontransparent boxes (like 4+4+4 cells) reduces the number of synchronization events by the factor 4-5 and proposes lightmatter interactions for a part of the cell-cell coupling mechanism. Considering a quantum nature of spin-conversion process, we assume the photon-assisted entanglement [25], which has been already demonstrated in a number of different quantum oscillators. Generation of in-phase and anti-phase correlated thermal and electrochemical waves confirms the hypothesis of spin-based effects since the isomers have not only different ionic reactivity but also heat capacity [19].…”

“…Shortdistance scenario includes molecular coupling mechanisms, among them exchange of protons in hydrogen-bound networks [23] leading to flip-flop processes of spin states. Physical implementation of cell-cell couplings is discussed in several works [30], which propose light-matter interactions, Rabi oscillations (dynamics of a spin in a magnetic field), spin-based interactions [35] or photon-assisted entanglement [25].…”

“…exchange of protons in hydrogen-bound networks [23] or by light-matter interactions [24]. Denoted as photon-assisted entanglement [25], this mechanism is found in different microscopic physical [26] and biological [27] systems, and is responsible for emergent behavior on macroscopic scales. Following this approach, it is expected to detect such synchronization effects in electrochemical systems that are observed in coupled quantum oscillators [30], [31], spin ensembles under light excitation [29] or optomicromechanics [28].…”

All-optical generation of deterministic squeezed Schrödinger-cat states

“…× sinh (r) cosh (r e ) + e iφe cosh (r) sinh (r e ) , (11) from which one can see that the mean photon number and the two-photon correlation strength can be suppressed completely (i.e., N eff , M eff = 0) when we reasonably adjust the amplitude and phase of the squeezed-vacuum reservoir under the parameter conditions [48]: r e = r and φ e = ±nπ (n = 1, 3, 5...), which plays a very important role in suppressing the influence of noise on the system, such as enhanced nonlinear interaction [48], optical nonreciprocity [49], state preparation [12,[50][51][52], etc. Besides the Hamiltonian in the squeezing representation can be derived as (dropping constant terms)…”

Nonreciprocal coupling induced entanglement enhancement in a double-cavity optomechanical system

“…COMS has attracted increasing attention due to its prominent applications in gravitational-wave detection, [3] photonic network, [4] metrology, [5] etc. With the rapid development of nanotechnology, COMS also provides a substantial platform for exploring quantum effects in an exceedingly wide range from microscale to macroscale, for instance, entanglement, [6][7][8][9] squeezing, [10][11][12][13] photon blockade, [14][15][16][17][18] transmission, [19] etc. As is known, entanglement is an enigmatic phenomenon in quantum mechanics and its detailed study would be beneficial.…”