TY - UNPB

T1 - On-chip spin-photon entanglement based on single-photon scattering

AU - Chan, Ming Lai

AU - Tiranov, Alexey

AU - Appel, Martin Hayhurst

AU - Wang, Ying

AU - Midolo, Leonardo

AU - Scholz, Sven

AU - Wieck, Andreas D.

AU - Ludwig, Arne

AU - Sørensen, Anders Søndberg

AU - Lodahl, Peter

N1 - 7 pages, 3 figures for the main text. 15 pages, 4 figures for the supplementary

PY - 2022/5/25

Y1 - 2022/5/25

N2 - The realization of on-chip quantum gates between photons and solid-state spins is a key building block for quantum-information processors, enabling, e.g., distributed quantum computing, where remote quantum registers are interconnected by flying photons. Self-assembled quantum dots integrated in nanostructures are one of the most promising systems for such an endeavor thanks to their near-unity photon-emitter coupling and fast spontaneous emission rate. Here we demonstrate an on-chip entangling gate between an incoming photon and a stationary quantum-dot spin qubit. The gate is based on sequential scattering of a time-bin encoded photon with a waveguide-embedded quantum dot and operates on sub-microsecond timescale; two orders of magnitude faster than other platforms. Heralding on detection of a reflected photon renders the gate fidelity fully immune to spectral wandering of the emitter. These results represent a major step in realizing a quantum node capable of both photonic entanglement generation and on-chip quantum logic, as demanded in quantum networks and quantum repeaters.

AB - The realization of on-chip quantum gates between photons and solid-state spins is a key building block for quantum-information processors, enabling, e.g., distributed quantum computing, where remote quantum registers are interconnected by flying photons. Self-assembled quantum dots integrated in nanostructures are one of the most promising systems for such an endeavor thanks to their near-unity photon-emitter coupling and fast spontaneous emission rate. Here we demonstrate an on-chip entangling gate between an incoming photon and a stationary quantum-dot spin qubit. The gate is based on sequential scattering of a time-bin encoded photon with a waveguide-embedded quantum dot and operates on sub-microsecond timescale; two orders of magnitude faster than other platforms. Heralding on detection of a reflected photon renders the gate fidelity fully immune to spectral wandering of the emitter. These results represent a major step in realizing a quantum node capable of both photonic entanglement generation and on-chip quantum logic, as demanded in quantum networks and quantum repeaters.

KW - quant-ph

U2 - 10.21203/rs.3.rs-1692898/v1

DO - 10.21203/rs.3.rs-1692898/v1

M3 - Preprint

BT - On-chip spin-photon entanglement based on single-photon scattering

PB - arxiv.org

ER -