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Dynamics of entanglement in two-qubit open system interacting with a squeezed thermal bath via dissipative interaction

Subhashish Banerjee, V. Ravishankar, R. Srikanth

arXiv:0901.0404Annals of PhysicsJan 19, 201049 citations

Steady-state entanglement of two coupled qubits

Elena del Valle

The maximum entanglement allowed between two coupled qubits in the steady state established by independent incoherent sources of excitation is reported. Asymmetric configurations where one qubit is excited while the other 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 is proposed to experimentally evidence such large degrees of entanglement.The maximum entanglement allowed between two coupled qubits in the steady state established by independent incoherent sources of excitation is reported. Asymmetric configurations where one qubit is excited while the other 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 is proposed to experimentally evidence such large degrees of entanglement.

arXiv:1005.4383Journal of the Optical Society of America BJan 6, 201125 citations

Entanglement for Two Dissipative Qubits

Xiufeng Li, Mao-Fa Fang

International Journal of Theoretical PhysicsJun 5, 20131 citation

Heat bath can generate all classes of three-qubit entanglement

Christopher Eltschka, Daniel Braun, Jens Siewert

It is common knowledge that coupling to a heat bath, in general, tends to reduce the entanglement in a quantum system. In recent years, increasing interest has been devoted to the opposite situation where thermal or specifically tailored environments may stabilize or even generate entanglement. We prove the universality of this phenomenon for multipartite entanglement in the frame of an exactly solvable dephasing model. We show by evaluating analytical lower bounds for the appropriate entanglement measures that a common thermal environment can dynamically generate all entanglement classes of three qubits for almost any initial product state. For sufficiently weak dissipation this entanglement may persist up to arbitrarily large times.It is common knowledge that coupling to a heat bath, in general, tends to reduce the entanglement in a quantum system. In recent years, increasing interest has been devoted to the opposite situation where thermal or specifically tailored environments may stabilize or even generate entanglement. We prove the universality of this phenomenon for multipartite entanglement in the frame of an exactly solvable dephasing model. We show by evaluating analytical lower bounds for the appropriate entanglement measures that a common thermal environment can dynamically generate all entanglement classes of three qubits for almost any initial product state. For sufficiently weak dissipation this entanglement may persist up to arbitrarily large times.

arXiv:1312.5733Physical Review AJun 6, 20146 citations

Controlling Thermal Entanglement in a Three-qubit Spin System

Jianping Li

International Journal of Theoretical PhysicsSep 5, 20160 citations

Quantum control of two-qubit entanglement dissipation

A. I. Solomon, S. G. Schirmer

arXiv:1109.1137Journal of Russian Laser ResearchSep 1, 20112 citations

Enforcing Thermal Entanglement of Three Coupled Qubits by Dissipation

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