IQIM Postdoctoral and Graduate Student Seminar

Friday, October 8, 2021
11:00am to 12:00pm
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Nuclear spin-wave quantum register for a rare-earth ion qubit
Andrei Ruskuc, Graduate Student, Faraon Group,

Abstract: Quantum networks will provide a new paradigm for connectivity using entanglement generation between nodes as a resource for secure cryptographic key distribution and interconnection of remote quantum computers. Building large-scale networks will rely on entanglement purification via repeater-type protocols, these require multi-node connectivity, enabled by secondary quantum registers at each node. We study a single 171-ytterbium ion doped into yttrium orthovanadate and coupled to a nanophotonic cavity as a node architecture; we previously demonstrated that these qubits have stable optical transitions and excellent spin coherence properties. In this talk I will present recent results realising a secondary register for the ytterbium qubit using collective excitations (spin-waves) of the surrounding vanadium nuclear spins. This is enabled by a set of novel quantum control protocols using a magnetically insensitive ytterbium spin transition to store and retrieve quantum information from the vanadium register. Unlike conventional, disordered nuclear spin quantum memories, this approach is reproducible and deterministic, i.e. every ytterbium qubit accesses an identical register. In the future, this framework will enable the exploration of single rare-earth ions doped into nuclear spin-rich hosts as a platform for realising large-scale quantum networks.

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For more information, please contact Marcia Brown by phone at 626-395-4013 or by email at marciab@caltech.edu.