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Poster Session

Poster Session II

4:00 pm – 6:00 pm, Wednesday June 18 Session H00 Oregon Convention Center, Exhibit Hall E
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Progress Towards Quantum Repeater Nodes Using Silicon-Vacancy Centers in Diamond

Poster 48
Presenter: Francisca Abdo Arias (Harvard University)
Authors: Yan Qi Huan (Harvard University), Aziza Suleymanzade (Harvard University), Pieter-Jan Stas (Harvard University), Yan-Cheng Wei (Harvard University), Erik Knall (Harvard University), Eugene Knyazev (Harvard University), Bart Machielse (Lightsynq Technologies Inc.), Umut Yazlar (Harvard University), Gefen Baranes (Harvard University), Maxim Sirotin (Harvard University), Can Knaut (Harvard University), Hongkun Park (Harvard University), Marko Loncar (Harvard University), Mikhail Lukin (Harvard University)

Quantum repeaters are a crucial component for long-range quantum networks, allowing network nodes to overcome photon loss by utilizing a long-lifetime quantum memory that can store quantum states across multiple node linking attempts. Silicon- vacancy (SiV) centers incorporated in diamond nanophotonic cavities have been shown to be a promising platform for quantum networking due to their efficient single-photon generation and spin-photon interface. In this work, we demonstrate the control of a weakly coupled 13C nuclear spin in this system, forming a two-qubit node with the SiV electron spin. We perform conditional gates between the electron and 13C spins, showing that each can be entangled independently with an incoming photon, and measure 13C coherence times exceeding 100 ms, even under repeated electron optical readout pulses. This long-lived memory capability, combined with the electron’s spin-photon interface, offers a route toward deterministic nonlocal gates and show ongoing attempts toward fully fledged quantum repeater protocols based on the SiV platform.

Funding acknowledgement

This work was supported by the AWS Center for Quantum Networking, the National Science Foundation (Grant No. PHY-2012023), NSF Center for Ultracold Atoms, the NSF Engineering Research Center for Quantum Networks (Grant No. EEC-1941583), CQN (EEC-1941583), and NSF QuSeC-TAQS OMA-2326787.

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