A scheme for tunable quantum phase gate and effective preparation of graph-state entanglement

TL;DR

This paper proposes a tunable quantum phase gate using three-level atoms or solid-state qubits, enabling controlled entanglement generation for quantum computing and information processing.

Contribution

It introduces a controllable quantum phase gate scheme and demonstrates its application in preparing graph-state entanglement.

Findings

Conditional phase shift is tunable via interaction time

Method effectively prepares graph-state entanglement

Applicable to various quantum systems like cavity QED and trapped ions

Abstract

A scheme is presented for realizing a quantum phase gate with three-level atoms, solid-state qubits--often called artificial atoms, or ions that share a quantum data bus such as a single mode field in cavity QED system or a collective vibrational state of trapped ions. In this scheme, the conditional phase shift is tunable and controllable via the total effective interaction time. Furthermore, we show that the method can be used for effective preparation of graph-state entanglement, which are important resources for quantum computation, quantum error correction, studies of multiparticle entanglement, fundamental tests of non-locality and decoherence.