Decoherence of two qubits in a non-Markovian squeezed reservoir

TL;DR

This paper investigates how two entangled qubits lose coherence in a non-Markovian squeezed reservoir, revealing that entanglement dynamics depend on the initial state and squeezing parameters, with phenomena like entanglement revival.

Contribution

It provides an exact analysis of entanglement decoherence in a non-Markovian squeezed environment, highlighting differences from vacuum cavity cases and the impact of initial Bell states.

Findings

Disentanglement time decreases with increasing squeeze parameter r.

Entanglement revives after complete disentanglement for even Bell states.

Entanglement exhibits decrease and revival before complete disentanglement for odd Bell states.

Abstract

The decoherence of two initially entangled qubits in a squeezed vacuum cavity has been investigated exactly. The results show that, first, in principle, the disentanglement time decreases with the increasing of squeeze parameter r, due to the augmenting of average photon number of every mode in squeezed vacuum cavity. Second, there are entanglement revivals after complete disentanglement for the case of even parity initial Bell state, while there are entanglement decrease and revival before complete disentanglement for the case of odd parity initial Bell state. The results are quite different from that of the case for qubits in a vacuum cavity.