Two-qubit controlled phase gate based on two nonresonant quantum dots trapped in a coupled-cavity array

TL;DR

This paper proposes a scheme to implement a two-qubit controlled phase gate using two nonidentical quantum dots in coupled photonic crystal cavities, enabling quantum logic operations without exciting the dots.

Contribution

The scheme allows realization of controlled phase gates with nonidentical quantum dots in coupled cavities without exciting the dots, under non-small hopping conditions.

Findings

Gate operation does not excite quantum dots.

Conditional phase acquisition enables controlled phase gate.

Compatible with single-qubit operations.

Abstract

We propose a scheme for realizing quantum controlled phase gates with two nonidentical quantum dots trapped in two coupled photonic crystal cavities and driven by classical laser fields under the condition of non-small hopping limit. During the gate operation, neither the quantum dots are excited, while the system can acquire different phases conditional upon the different states of the quantum dots. Along with single-qubit operations, a two-qubit controlled phase gate can be achieved.