Quantum controlled phase gate based on two nonresonant quantum dots trapped in two coupled photonic crystal cavities

TL;DR

This paper proposes a scheme to implement two-qubit quantum phase gates using nonidentical quantum dots in coupled photonic crystal cavities, minimizing decoherence by avoiding excitation of cavity modes and quantum dots.

Contribution

It introduces a novel method for realizing controlled phase gates with nonresonant quantum dots in coupled cavities, reducing decoherence effects.

Findings

Gate operation does not excite cavity modes or quantum dots

System acquires conditional phase for quantum gate implementation

Method suppresses decoherence during quantum gate operation

Abstract

We propose a scheme for realizing two-qubit quantum phase gates with two nonidentical quantum dots trapped in two coupled photonic crystal cavities and driven by classical laser fields. During the gate operation, neither the cavity modes nor the quantum dots are excited, so the decoherence can be suppressed. The system can acquire a phase conditional upon the states of the quantum dots, which can be used to realize the controlled phase gate.