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: G07.00005 : Quantum Computing Enhanced Sensing*
11:18 AM–11:30 AM
Presenter:
Francisco Machado
(ITAMP, Harvard-Smithsonian Center for Astrophysics)
Authors:
Francisco Machado
(ITAMP, Harvard-Smithsonian Center for Astrophysics)
Richard R Allen
(Massachusetts Institute of Technology)
Robert Huang
(Massachusetts Institute of Technology and Google Quantum AI)
Isaac L Chuang
(Massachusetts Institute of Technology)
Soonwon Choi
(Massachusetts Institute of Technology)
In this talk, we consider a novel setting, where the quantum sensor particles are connected to a small quantum computer or register capable of executing elementary algorithms. We show that such a setting can drastically improve sensing for a specific task that we call quantum search sensing (QSS): the detection of a weak oscillating signal at an unknown frequency. QSS problems are pervasive in physical sciences, ranging from the detection of gravitational waves and the search for dark matter to applications in nuclear magnetic resonance (NMR) spectroscopy. By constructing an explicit algorithm, we show that having a quantum computer can improve the scaling of both sensitivity (the minimal detectable strength of a signal) and bandwidth (the maximum frequency range over which a signal is sought) in QSS as a function of total measurement time; this improvement directly originates from a quantum algorithmic speed-up. Furthermore, we demonstrate that our approach is optimal, saturating a fundamental limit set by quantum mechanics up to logarithmic corrections. We discuss the implementation of our algorithms in real-world experimental platforms such as an NV-center interacting with nearby nuclear spins.
*FM acknowledges support from the NSF through a grant for ITAMP at Harvard University.RA acknowledges support through the NSF Graduate Research Fellowship Program.We acknowledge support from the NSF through the Center for Ultracold Atoms.
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