TY - JOUR

T1 - On-chip spin-photon entanglement based on photon-scattering of a quantum dot

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 - Sorensen, Anders Sondberg

AU - Lodahl, Peter

PY - 2023/5/19

Y1 - 2023/5/19

N2 - The realization of on-chip quantum interfaces between flying 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 into 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 high-fidelity on-chip entanglement between an incoming photon and a stationary quantum-dot hole spin qubit. The entanglement is induced by sequential scattering of the time-bin encoded photon interleaved with active spin control within a microsecond, two orders of magnitude faster than those achieved in other solid-state platforms. Conditioning on the detection of a reflected photon renders the entanglement fidelity immune to the spectral wandering of the emitter. These results represent a major step towards realizing a quantum node capable of interchanging information with flying photons and on-chip quantum logic, as required for quantum networks and quantum repeaters.

AB - The realization of on-chip quantum interfaces between flying 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 into 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 high-fidelity on-chip entanglement between an incoming photon and a stationary quantum-dot hole spin qubit. The entanglement is induced by sequential scattering of the time-bin encoded photon interleaved with active spin control within a microsecond, two orders of magnitude faster than those achieved in other solid-state platforms. Conditioning on the detection of a reflected photon renders the entanglement fidelity immune to the spectral wandering of the emitter. These results represent a major step towards realizing a quantum node capable of interchanging information with flying photons and on-chip quantum logic, as required for quantum networks and quantum repeaters.

KW - LOGIC GATE

KW - STATE

KW - GENERATION

KW - INTERFACE

KW - TRANSPORT

KW - ATOM

U2 - 10.1038/s41534-023-00717-5

DO - 10.1038/s41534-023-00717-5

M3 - Journal article

VL - 9

JO - npj Quantum Information

JF - npj Quantum Information

SN - 2056-6387

IS - 1

M1 - 49

ER -