Realization of a deterministic quantum Toffoli gate with a single photon

TL;DR

This paper reports the experimental realization of a deterministic quantum Toffoli gate using a single photon’s degrees of freedom, achieving high conversion efficiency without auxiliary photons or probabilistic post-selection.

Contribution

The work demonstrates a novel, deterministic implementation of a quantum Toffoli gate with high efficiency, avoiding the need for auxiliary photons or probabilistic methods.

Findings

Achieved a 95.1% conversion rate for the Toffoli gate.

Successfully generated Bell states using the controlled NOT gate.

Implemented a deterministic quantum Toffoli gate with a single photon.

Abstract

Quantum controlled-logic gates, including controlled NOT gate and Toffoli gate, play critical roles in lots of quantum information processing schemes. We design and experimentally demonstrate deterministic Toffoli gate by utilizing orbital-angular-momentum and polarization degrees of freedom of a single photon. In addition, we generate Bell states by using the controlled NOT gate. The effective conversion rate of the Toffoli gate in our experiment is $(95.1\pm3.2)\%$. Furthermore, our experimental setup does not require any auxiliary photons and probabilistic post selections.