Implementation of CU gates and its application in a remote-controlled quantum operation

TL;DR

This paper presents a scheme for implementing controlled-unitary (CU) gates between arbitrary quantum gates using single-photon degrees of freedom, demonstrating remote-controlled single-qubit gates with high fidelity for secure quantum processing.

Contribution

It introduces an experimental method for remote-controlled CU gates between arbitrary unitary operations using polarization and time-bin encoding.

Findings

Successfully implemented remote-controlled single-qubit gates with high process fidelity.

Demonstrated the feasibility of controlling quantum gates remotely for secure quantum processing.

Proposed a versatile scheme applicable to distributed quantum networks.

Abstract

Recently, remote-controlled quantum information processing has been proposed for its applications in secure quantum processing protocols and distributed quantum networks. For remote-controlled quantum gates, the experimental realization of controlled unitary (CU) gates between any quantum gates is an essential task. Here, we propose and experimentally demonstrate a scheme for implementing CU gates between arbitrary pairs of unitary gates using the polarization and time-bin degrees of freedom of single-photons. Then, we experimentally implement remote-controlled single-qubit unitary gates by controlling either the state preparation or measurement of the control qubit with high process fidelities. We believe that the proposed remote-controlled quantum gate model can pave the way for secure and efficient quantum information processing.