Demonstration of a quantum C-NOT Gate in a Time-Multiplexed fully reconfigurable photonic processor

TL;DR

This paper demonstrates a high-fidelity, reconfigurable photonic quantum C-NOT gate using a scalable time-multiplexed architecture, enabling complex quantum circuit operations.

Contribution

It introduces a fully reconfigurable, time-multiplexed photonic platform capable of implementing a high-fidelity C-NOT gate and generating Bell states.

Findings

Achieved a C-NOT gate fidelity of 93.8%

Demonstrated generation of all four Bell states

Showcased reconfigurability of the photonic processor

Abstract

The two-qubit controlled-not (C-NOT) gate is an essential component for gate-based quantum circuits. In fact, its operation, combined with single qubit rotations allows to realise any quantum circuit. Several strategies have been adopted in order to build quantum gates. Among them, photonics offers the dual advantage of excellent isolation from the environment and ease of manipulation at the single qubit level. Here we adopt a scalable time-multiplexed approach in order to build a fully reconfigurable architecture capable of implementing a post-selected C-NOT gate with a fidelity of $(93.8 \pm 1.4)\%$. We then show how our time-multiplexed platform can be employed to combine a C-NOT and a single qubit gate in order to generate the four Bell states.