Entanglement between qubits induced by a common environment with a gap

Abstract

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.

accepted for publication in Physical Review A

References in corpus (1)

• Entanglement of an impurity and conduction spins in the Kondo model

Cited by in corpus (4)

• Dynamics of the entanglement between two oscillators in the same environment
• Dynamical phases for the evolution of the entanglement between two oscillators coupled to the same environment
• Off-resonant entanglement generation in a lossy cavity
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