Normal mode splitting and optical squeezing in a linear and quadratic optomechanical system with optical parametric amplifier

Singh, Shailendra Kumar; Mazaheri, Mehdi; Peng, Jiaxin; Sohail, Amjad; Gu, Zhidong; Asjad, Muhammad Imran

doi:10.1007/s11128-023-03947-w

Cited by 19 publications

(2 citation statements)

References 64 publications

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“…This allows us to simplify the QLEs by expressing any operator as the sum of its mean value and its fluctuation, i.e. 70 – 72 , where , and then substitute this into Eqs. ( 7 ), ( 8 ), ( 9 ) and ( 10 ).…”

Section: Quantum Dynamics and Entanglement Of The Coupled Magnomechan...mentioning

confidence: 99%

Distant entanglement via photon hopping in a coupled cavity magnomechanical system

Sohail,

Peng,

Hidki

et al. 2023

Sci Rep

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We theoretically propose a scheme to generate distant bipartite entanglement between various subsystems in coupled magnomechanical systems where both the microwave cavities are coupled through single photon hopping coupling strength Γ. Each cavity contains a magnon mode and phonon mode and this gives six excitation modes in our model Hamiltonian which are cavity-1 photons, cavity-2 photons, magnon and phonon in cavity-1, and magnon and phonon in cavity-2. We found that significant bipartite entanglement exists between indirectly coupled subsystems in coupled microwave cavities for an appropriate set of parameters regime. Moreover, we also obtain suitable cavity and magnon detuning parameters for a significant distant bipartite entanglement in different bipartitions. In addition, it can be seen that a single photon hopping parameter significantly affects both the degree as well as the transfer of quantum entanglement between various bipartitions. Hence, our present study related to coupled microwave cavity magnomechanical configuration will open new perspectives in coherent control of various quantum correlations including quantum state transfer among macroscopic quantum systems.

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Section: Quantum Dynamics and Entanglement Of The Coupled Magnomechan...mentioning

confidence: 99%

Distant entanglement via photon hopping in a coupled cavity magnomechanical system

Sohail,

Peng,

Hidki

et al. 2023

Sci Rep

Self Cite

View full text Add to dashboard Cite

show abstract

“…Most importantly, these studies symbolize the extension of previous results in discrete quantum states to continuous variable quantum states. In addition, Gaussian states are also very successful to describe various important microscopic as well as macroscopic quantum systems, such as electromagnetic fields, Josephson junctions, optomechanical and opto-magnomechanical oscillators [1,2,[16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

A comprehensive perspective for single-mode Gaussian coherence

Singh,

ur Rahman,

Mazaheri

et al. 2024

Phys. Scr.

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In this work, we theoretically investigate single-mode Gaussian quantum coherence from a comprehensive perspective. Based on analytical expressions of the first and second moments of single-mode Gaussian states undergoing various Gaussian noisy channels, we use quantum mater equation and the method of the relative entropy to quantify the quantum coherence of any single-mode Gaussian state. We demonstrate that the displaced thermal state achieves maximum quantum coherence when using only the displaced vacuum state, which is a pure coherent state. However, for various lossy noise channels, quantum coherence shows a significant decrease. In the context of a squeezed thermal state, when controlling the squeezing parameter for a given environmental temperature, quantum coherence has been witnessed to increase. The ultimate upper bound of quantum coherence is then attained with the squeezed vacuum state. In particular, we determined the most generalized scenario of the displaced squeezed thermal state. The maximum value of quantum coherence is obtained when displacement and squeeze parameters both attain maximum value. Our study might be important in the future for the characterisation as well as the estimation of various nonclassical quantum correlations in single-mode Gaussian states.

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Improving the Performance of Cooling and Entanglement in a Double Cavity Optomechanical System Assisted by the Quantum Coherent Feedback

Chen,

Chen

2024

Annalen der Physik

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A theoretical scheme is proposed for improving the performance of cooling and entanglement, where the physical model is based on a double cavity optomechanical system assisted by the field‐mediated coherent feedback. The cooling performance is evaluated by calculating the final mean phonon number. The steady‐state bipartite entanglement between the optical mode and mechanical mode is measured by the logarithmic negativity. The result manifests that with assistance of the quantum coherent feedback, the mechanical resonator (MR) can be cooled close to its quantum ground state and the steady‐state optomechanical entanglement is simultaneously created, all of which are obtained under the condition beyond the resolved sideband. The presented feedback strategy is measurement‐independent, which can effectively preserve the quantum coherence of system. The scheme is conducive to relaxing the current experimental condition and it may provide a new path for the optomechanical manipulation involving the low‐frequency MR.

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Normal mode splitting and optical squeezing in a linear and quadratic optomechanical system with optical parametric amplifier

Cited by 19 publications

References 64 publications

Distant entanglement via photon hopping in a coupled cavity magnomechanical system

Distant entanglement via photon hopping in a coupled cavity magnomechanical system

A comprehensive perspective for single-mode Gaussian coherence

Improving the Performance of Cooling and Entanglement in a Double Cavity Optomechanical System Assisted by the Quantum Coherent Feedback

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