Quantum coherence, correlations and nonclassical states in the two-qubit Rabi model with parametric oscillator

Yogesh, V.; Maity, Prosenjit

doi:10.1016/j.physa.2021.126641

Cited by 3 publications

(1 citation statement)

References 54 publications

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“…Quantum coherence counts among fundamental resources in quantum information processing and quantum computation [10,11,64]. It also provides great applications in the context of quantum sensing [65], quantum thermodynamics [66][67][68], quantum biology [8] and non-equilibrium models [4,69,70].…”

Section: Discussionmentioning

confidence: 99%

Thermally-induced qubit coherence in quantum electromechanics

2022

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Quantum coherence, the ability of a quantum system to be in a superposition of orthogonal quantum states, is a distinct feature of the quantum mechanics, thus marking a deviation from classical physics. Coherence finds its applications in quantum sensing and metrology, quantum thermodynamics and computation. A particularly interesting is the possibility to observe coherence arising in counter-intuitive way from thermal energy that is without implementation of intricate protocols involving coherent driving sequences. In this manuscript, we investigate quantum coherence emerging in a hybrid system composed of a two-level system (qubit) and a thermal quantum harmonic oscillator (a material mechanical oscillator), inspired by recent experimental progress in fabrication of such systems. We show that quantum coherence is created in such a composite system solely from the interaction of the parts and persists under relevant damping. Implementation of such scheme will demonstrate previously unobserved mechanisms of coherence generation and can be beneficial for hybrid quantum technologies with mechanical oscillators and qubits.

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Section: Discussionmentioning

confidence: 99%

Thermally-induced qubit coherence in quantum electromechanics

2022

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Freezing of quantum and classical correlations via trace and Hellinger distances

Tang¹,

Shao-Chen²,

Hou³

2022

Physica A: Statistical Mechanics and its Applications

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First-order quantum phase transition in the two-qubit squeezed Rabi model

Pei,

Shi,

Shen

et al. 2024

J. Opt. Soc. Am. B

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We study the ground state of the two-qubit squeezed Rabi model. Two special transformations are found to diagonalize the system Hamiltonian when each qubit’s frequency is close to the field frequency, where both the squeezing and counterrotating-wave interactions are removed, leading to an effective integrable Hamiltonian. The analytical ground state is determined and matches with numerical solutions well for a range of squeezing strengths and qubit-field detunings in the ultrastrong-coupling regime. We demonstrate that the ground state exhibits a first-order quantum phase transition at a phase boundary linearly induced by the squeezed light. We characterize the two-qubit negativity analytically and find that its two-qubit entanglement increases with the increasing squeezing strength nonlinearly. The average photon numbers of the field mode and variances of position and momentum quadratures are also analyzed and discovered to have a nonlinear relation with the squeezing strength. Finally, we discuss the experimental scheme and realization possibility of the predicted results.

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Quantum coherence, correlations and nonclassical states in the two-qubit Rabi model with parametric oscillator

Cited by 3 publications

References 54 publications

Thermally-induced qubit coherence in quantum electromechanics

Thermally-induced qubit coherence in quantum electromechanics

Freezing of quantum and classical correlations via trace and Hellinger distances

First-order quantum phase transition in the two-qubit squeezed Rabi model

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