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On-Demand Source of Dual-Rail Photon Pairs Based on Chiral Interaction in a Nanophotonic Waveguide
Journal article   Open access   Peer reviewed

On-Demand Source of Dual-Rail Photon Pairs Based on Chiral Interaction in a Nanophotonic Waveguide

Freja T. Ostfeldt, Eva M. Gonzalez-Ruiz, Nils Hauff, Ying Wang, Andreas D. Wieck, Arne Ludwig, Ruediger Schott, Leonardo Midolo, Anders S. Sorensen, Ravitej Uppu, …
PRX quantum, Vol.3(2), p.020363
06/01/2022
DOI: 10.1103/PRXQuantum.3.020363
url
https://doi.org/10.1103/PRXQuantum.3.020363View
Published (Version of record) Open Access

Abstract

Entanglement is the fuel of advanced quantum technology, enabling, e.g., measurement-based quantum computing and loss-tolerant encoding of quantum information. In photonics, entanglement has tradition-ally been generated probabilistically, requiring massive multiplexing for scaling up to many photons. An alternative approach utilizing quantum emitters in nanophotonic devices can realize deterministic genera-tion of entangled photons. However, such sources generate polarization entanglement that is incompatible with spatial dual-rail qubit encoding employed in scalable photonic quantum-computing platforms uti-lizing integrated circuits. Here we propose and experimentally realize an on-demand source of dual-rail photon pairs using a quantum dot in a planar nanophotonic waveguide. The source exploits the cascaded decay of a biexciton state and chiral light-matter coupling to achieve deterministic generation of spatial dual-rail Bell pairs with the amount of entanglement determined by the chirality. The operational princi-ple can readily be extended to multiphoton entanglement generation required for efficient preparation of resource states for photonic quantum computing.
Physical Sciences Physics Physics, Applied Physics, Multidisciplinary Quantum Science & Technology Science & Technology

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