Bulletin of the American Physical Society
55th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Monday–Friday, June 3–7, 2024; Fort Worth, Texas
Session G07: Quantum Metrology and Sensing: General II
10:30 AM–12:30 PM,
Wednesday, June 5, 2024
Room: 203A
Chair: Agnes Vibok, University of Debrecen
Abstract: G07.00008 : Understanding and Improving Qubit Coherence in a Dense Nuclear Spin Environment Using Cluster Correlation Expansion Methods*
11:54 AM–12:06 PM
Presenter:
Erin Liu
(Caltech)
Authors:
Erin Liu
(Caltech)
Sophie Hermans
(California Institute of Technology)
Emanuel Green
(California Institute of Technology)
Adrià Riera Moral
(Delft University of Technology)
Chun-Ju Wu
(Caltech)
Andrei Ruskuc
(Caltech)
Andrei Faraon
(Caltech)
Despite the first-order magnetic insensitivity, the Yb3+ qubit has a limited coherence time currently understood to be set by interactions with nearby spins.1 We construct a model using cluster correlation expansion methods to study noise generated by the dense V5+ nuclear spin bath and paramagnetic defects in the crystal.2 The model also enables us to design pulse sequences to combat undesired interactions.
The V5+ spins, while a noise source, offer resources for ensemble-based memories for quantum states. Control of the second shell of nearest neighbor V5+ spins has been demonstrated.3 As we develop control techniques for first shell spins, our model will provide insight into how the spin environment affects the manipulation and storage of these new quantum memories.
This research serves as a solid foundation for understanding how to optimize qubit coherence and harness new memory resources as we work towards a future quantum internet.
1. Kindem, J.M., Ruskuc, A., Bartholomew, J.G. et al. Control and single-shot readout of an ion embedded in a nanophotonic cavity. Nature 580, 201–204 (2020).
2. Onizhuk, M. and Galli, G. PyCCE: A Python Package for Cluster Correlation Expansion Simulations of Spin Qubit Dynamics. Adv. Theory Simul., 4: 2100254 (2021).
3. Ruskuc, A., Wu, CJ., Rochman, J. et al. Nuclear spin-wave quantum register for a solid-state qubit. Nature 602, 408–413 (2022).
*This research is supported by AFOSR (grant no. FA9550-22-1-0178), IQIM, an NSF Physics Frontiers Center (grant no. PHY-1733907), and NSF (grant no. 2210570).
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