Finite time decoherence could be suppressed efficiently in photonic crystal

TL;DR

This paper demonstrates that finite-time decoherence of entangled qubits can be effectively suppressed in anisotropic band gap photonic crystals, enhancing entanglement preservation compared to vacuum or typical reservoirs.

Contribution

It provides an analytical study of decoherence dynamics without approximations, revealing improved entanglement preservation in photonic crystals and proposing a storage scheme for entangled pairs.

Findings

Decoherence can be suppressed efficiently in photonic crystals.

Entanglement of odd parity Bell states is more robust.

Photonic crystals alter decoherence dynamics significantly.

Abstract

The decoherence of two initially entangled qubits in anisotropic band gap photonic crystal has been studied analytically without Born or Markovian approximation. It is shown that the decoherence dynamics of two qubits in photonic crystal is greatly different from that of two qubits in vacuum or subjected to usual non-Markovian reservoir. The results also show that the finite time decoherence invoked by spontaneous emission could be suppressed efficiently and the entanglement of the Bell state possesses odd parity is more easily preserved in photonic crystal than that of the Bell state possesses even parity under the same condition. A store scheme for entangled particle pair is proposed.