Experimental demonstration of teleportation-based programmable quantum gate

TL;DR

This paper reports an experimental realization of a teleportation-based programmable quantum gate using linear optics, demonstrating high-fidelity operation and programmability through quantum process tomography.

Contribution

It presents the first experimental demonstration of a teleportation-based programmable quantum gate with high fidelity and full process characterization.

Findings

Successful implementation of a programmable quantum gate using linear optics

High-fidelity quantum process tomography confirms gate performance

Demonstrates programmability in quantum gate operations

Abstract

We experimentally demonstrate a programmable quantum gate that applies a sign flip operation to data qubit in an arbitrary basis fully specified by the quantum state of a two-qubit program register. Our linear-optical implementation is inspired by teleportation-based schemes for quantum computing and relies on multiphoton interference and coincidence detection. We confirm the programmability of the gate and its high-fidelity performance by carrying out full quantum process tomography of the resulting operation on data qubit for several different programs.