Quantum Entanglement in a System of Two Spatially Separated Atoms Coupled to the Thermal Reservoir

Liao, Xiang-Ping; Mao-Fa, Fang; Zheng, Xuejun; Jian-Wu, Cai

doi:10.1088/0256-307x/23/12/004

Cited by 7 publications

(2 citation statements)

References 30 publications

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“…Therefore, the generation of superconducting qubits and processing of information with these qubits are the main questions that need to be investigated. Additionally, it is also equally important to explore environmental noises and temperature effects on the superconducting qubits [5][6][7][8][9]. The coherence of superconducting qubits is greatly improved by reducing their sensitivity to the charge noise via shunting a large capacitance to the Josephson junction.…”

Section: Introductionmentioning

confidence: 99%

Thermal entanglement of superconducting qubits for arbitrary interaction strength

Ayoub,

Akram

2022

Preprint

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We investigate the thermal entanglement in two superconducting qubits for arbitrary interaction strength and ground state frequencies. We calculate the concurrence of the system to quantify the thermal entanglement. We suggest a scheme, where an external tunable coupler qubit sandwich between two superconducting qubits generates entanglement. The behavior of concurrence is analyzed for three different cases, in which we consider the effects of the temperature, the qubit-qubit effective coupling strength, and the qubit frequencies on the thermal entanglement. What deserves mentioning here is that to achieve maximally entangled states, it is better to use two superconducting qubits with the same frequencies. We also note that for a given temperature, the thermal entanglement can be tuned by qubit internal capacitance and inductance.

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Section: Introductionmentioning

confidence: 99%

Thermal entanglement of superconducting qubits for arbitrary interaction strength

Ayoub,

Akram

2022

Preprint

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“…The last two are affected by a possible coupling between the qubits, and are also known in the atomic literature as the symmetric and antisymmetric collective states [5]. The formation and degradation of such states when subjected to spontaneous emission has been the object of much recent research [6][7][8], focusing on the preservation of entanglement into decoherence-free subspaces and taking advantage of the collective damping or effective coupling created between the qubits by interaction with common reservoirs [9][10][11][12][13][14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Steady-state entanglement of two coupled qubits

Valle¹

2011

J. Opt. Soc. Am. B

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The maximum entanglement between two coupled qubits in the steady state under two independent incoherent sources of excitation is reported. Asymmetric configurations where one qubit is excited while the other one dissipates the excitation are optimal for entanglement, reaching values three times larger than with thermal sources. The reason is the purification of the steady state mixture (that includes a Bell state) thanks to the saturation of the pumped qubit. Photon antibunching between the cross emission of the qubits can be used to experimentally evidence the large degrees of entanglement.

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Rank dependence of entanglement sudden death of a two-qubit system in a thermal reservoir

Namitha

Paulson

Satyanarayana

2019

J Opt

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Quantum Entanglement in a System of Two Spatially Separated Atoms Coupled to the Thermal Reservoir

Cited by 7 publications

References 30 publications

Thermal entanglement of superconducting qubits for arbitrary interaction strength

Thermal entanglement of superconducting qubits for arbitrary interaction strength

Steady-state entanglement of two coupled qubits

Rank dependence of entanglement sudden death of a two-qubit system in a thermal reservoir

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