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: G07.00009 : Interaction-enabled readout of anisotropic quantum spin projection noise in a two-dimensional ensemble of solid-state spins*
12:06 PM–12:18 PM
Presenter:
Weijie Wu
(Harvard University)
Authors:
Weijie Wu
(Harvard University)
Emily J Davis
(New York University (NYU))
Zilin Wang
(Harvard University)
Lillian Hughes
(University of California, Santa Barbara)
Bingtian Ye
(Harvard University)
Simon A Meynell
(University of California, Santa Barbara)
Sabrina Chern
(Harvard University)
Zhiran Zhang
(University of California, Santa Barbara)
Che Liu
(Harvard University)
Haopu Yang
(Harvard University)
Ania C Jayich
(University of California, Santa Barbara)
Norman Yao
(Harvard University)
Harnessing crucial recent developments in sample fabrication [Hughes, L. B. et al. APL Materials 11, 021101 (2023)], we first present measurements of mean-field quench dynamics generated by power-law XXZ interactions within a two-dimensional ensemble of NV centers. The same dynamics also reshape (squeeze) the QSPN, but because the readout of the spin state is photon-shot-noise-limited, only the mean spin direction can be directly measured. We thus develop and implement a protocol to circumvent this problem and experimentally characterize the variance of the QSPN using only global measurements of the total spin length. Our method is furthermore broadly applicable to a variety of platforms.
Our measurements reveal that the QSPN of the NV ensemble is indeed reduced during quench dynamics compared to the noise of the initial state, a necessary condition for achieving entanglement-enhanced sensing. We discuss the next step to verify that the spins are entangled by showing that the squeezing parameter, which compares the variance of the QSPN to the length of the total spin vector, is less than one. We analyze what limits our current measured value of the squeezing parameter and discuss strategies for improvement.
*US Department of Energy (BES grantno. DE-SC0019241) and the Army Research Office through the MURI programme (grant no. W911NF-20-1-0136)
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