Efficient High-Fidelity Flying Qubit Shaping

Abstract

Matter qubit to traveling photonic qubit conversion is the cornerstone of numerous quantum technologies such as distributed quantum computing, as well as several quantum internet and networking protocols. We formulate a theory for stimulated Raman emission which is applicable to a wide range of physical systems including quantum dots, solid state defects, and trapped ions, as well as various parameter regimes. We find the upper bound for the photonic pulse emission efficiency of arbitrary matter qubit states for imperfect emitters and show a path forward to optimizing the fidelity. Based on these results we propose a paradigm shift from optimizing the drive to directly optimizing the temporal mode of the flying qubit using a closed-form expression. Protocols for the production of time-bin encoding and spin-photon entanglement are proposed. Furthermore, the mathematical idea to use input-output theory for pulses to absorb the dominant emission process into the coherent dynamics, followed by a non-Hermitian Schrödinger equation approach has great potential for studying other physical systems.

arXiv comment11 pages, 6 figures

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Cited by in corpus (6)

• High-purity single-photon generation based on cavity QED
• Entanglement generation using single-photon pulse reflection in realistic networks
• Fast storage of photons in cavity-assisted quantum memories
• Engineering propagating cat states with driving-assisted cavity QED
• Input-Output Hierarchical Equations Of Motion
• Pulsed Quantum Excitation