Reconfigurable controlled two-qubit operation on a quantum photonic chip

TL;DR

This paper demonstrates a reconfigurable two-qubit quantum gate on a photonic chip, enabling programmable quantum operations with high fidelity, advancing integrated quantum photonics for quantum information processing.

Contribution

It introduces a reconfigurable controlled two-qubit operation on a photonic chip using a multiwaveguide interferometer with a tunable phase shifter, showing high experimental fidelity.

Findings

Average similarity between measured and ideal operations is 0.98

Reconfigurable two-qubit operation successfully implemented on chip

High agreement between theory and experiment

Abstract

Integrated quantum photonics is an appealing platform for quantum information processing, quantum communication and quantum metrology. In all these applications it is necessary not only to be able to create and detect Fock states of light but also to program the photonic circuits that implements some desired logical operation. Here we demonstrate a reconfigurable controlled two-qubit operation on a chip using a multiwaveguide interferometer with a tunable phase shifter. We find excellent agreement between theory and experiment, with a 0.98 \pm 0.02 average similarity between measured and ideal operations.