Protocol for nearly deterministic parity projection on two photonic qubits

TL;DR

This paper proposes a nearly deterministic parity projection protocol for two photonic qubits that only requires stable matter-photon Controlled-Phase gates, simplifying experimental implementation in photonic quantum information processing.

Contribution

It introduces a protocol that achieves high-fidelity parity projection without needing perfect Controlled-Z gates, easing experimental challenges.

Findings

Protocol is nearly deterministic and experimentally feasible.

Does not require perfect Controlled-Z gates, only stable Controlled-Phase gates.

Enhances practical implementation of photonic quantum information processing.

Abstract

Photonic parity projection plays a significant role in photonic quantum information processing. Non-destructive parity projections normally require high-fidelity Controlled-Z gates between photonic and matter qubits, which can be experimentally demanding. In this paper, we propose a nearly deterministic parity projection protocol on two photonic qubits which only requires stable matter-photon Controlled-Phase gates. The fact that our protocol does not require perfect Controlled-Z gates makes it more amenable to experimental implementation.