Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session G74: Novel Spin Qubit Materials and Technologies I
11:30 AM–2:18 PM,
Tuesday, March 7, 2023
Room: Room 403/404
Sponsoring
Unit:
DQI
Chair: J. Carlos Egues, University of Basel
Abstract: G74.00012 : Decoherence-free subspace of nuclear spins coupled to a rare-earth ion qubit
2:06 PM–2:18 PM
Presenter:
Chun-Ju Wu
(Caltech)
Authors:
Chun-Ju Wu
(Caltech)
Andrei Ruskuc
(Caltech)
Joonhee Choi
(Caltech)
Andrei Faraon
(Caltech)
Previously, we demonstrated polarization and coherent control of vanadium lattice nuclear spins surrounding optically addressable ytterbium qubits inside a yttrium orthovanadate host crystal.
Via high fidelity quantum control, we can engineer an interaction between Yb and the V nuclear spin ensemble, efficiently creating a highly entangled Yb-V GHZ state. Crucially, we identify the decoherence-free subspace of the collective nuclear spin state, which is insensitive to the correlated magnetic field noise generated by the Yb dipolar field. The common-mode noise rejection is a result of the symmetrical position of V ions relative to Yb, leading to long coherence times for these particular spin-ensemble states.
We verify the presence of the decoherence-free states by examining the Zeeman sensitivity to applied static fields and by testing their robustness against a range of different Yb-induced noise processes. These noise-insensitive states open up an opportunity to sense nuclear spin-nuclear spin interactions and demonstrate the first step toward decoherence-protected memories for quantum network applications.
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