Entanglement between qubits induced by a common environment with a gap

Details Entanglement between qubits induced by a common environment with a gap Entanglement between qubits induced by a common environment with a gap

2006-05-03

arxiv.org/abs/quant-ph/0605033v1

Phys. Rev. A 73, 062306 (2006)

Physics

Quantum Physics

accepted for publication in Physical Review A

Scientific paper

10.1103/PhysRevA.73.062306

We study a system of two qubits interacting with a common environment, described by a two-spin boson model. We demonstrate two competing roles of the environment: inducing entanglement between the two qubits and making them decoherent. For the environment of a single harmonic oscillator, if its frequency is commensurate with the induced two-qubit coupling strength, the two qubits could be maximally entangled and the environment could be separable. In the case of the environment of a bosonic bath, the gap of its spectral density function is essential to generate entanglement between two qubits at equilibrium and for it to be used as a quantum data bus.

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