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

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.

From teacher-education university to comprehensive university: Case studies of East China Normal University, Southwest University and Yanbian University

“…The preparation of multiparticle complete graph states can be conceptually divided into two primary categories. The first approach is applicable to arbitrary graph states, employing the mathematically proven two-qubit controlled-Z gate (CZ) [22][23][24]. However, these protocols are constrained by the operational time and fidelity of the logic gate.…”