Photonic Qubit Gates via 1D Scattering from an Array of Two-Level Emitters

2025/04/20 by Evangelos Varvelis, Joachim Ankerhold, Varvelis, Evangelos +1
#quant-ph #physics.optics

paper · pdf · doi:10.1038/s41534-026-01324-w

Abstract

Photonic quantum computing offers a promising platform for quantum information processing, benefiting from the long coherence times of photons and their ease of manipulation. This paper presents a scheme for implementing a deterministic phase gate for dual-rail number encoded photonic qubits, leveraging a standard 1D waveguide coupled to an array of two-level emitters (TLE). Using a transfer matrix approach, we develop a protocol for deterministic phase gate operation, demonstrating its robustness against non-waveguide mode coupling and disorder. Finally, we relax the idealized assumption of monochromatic light, considering finite-bandwidth pulses. Despite these realistic considerations, our results indicate high fidelity for the proposed phase gate protocol. Finally we will discuss two qubit operations.

Related

• Efficient scheme for realizing a multiplex-controlled phase gate with photonic qubits in circuit quantum electrodynamics
• Implementation of phase gates using single photons
• Photonic quantum computing with probabilistic single photon sources but without coherent switches
• Protocol for nearly deterministic parity projection on two photonic qubits
• Realization of a Universal Quantum Gate Set for Itinerant Microwave Photons