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 R10: Sensing with a Quantum Advantage
2:00 PM–4:00 PM,
Thursday, June 6, 2024
Room: 204AB
Chair: Michael Chapman, Georgia Institute of Technology
Abstract: R10.00004 : Impact of realistic noise on quantum metrological advantage using BECs
3:12 PM–3:24 PM
Presenter:
Katarzyna Krzyzanowska
(Los Alamos Natlional Laboratory)
Authors:
Katarzyna Krzyzanowska
(Los Alamos Natlional Laboratory)
Bharath Hebbe Madhusudhana
(Los Alamos National Lab)
Phillip I Martin
(Los Alamos National Laboratory)
Malcolm G Boshier
(Los Alamos Natl Lab)
We consider three sources of error affecting a DQC1 circuit (i) impurity of the initial state, (ii) decay and loss of atoms, causing a Markovian error and (iii) fluctuation of external magnetic fields causing a non-Markovian error. We model the impurity of the initial state using an incoherent mixture of a pure state and the uniformly mixed state. We show that the quantum advantage remains, for any non-zero proportion of the pure state in the mixture. Along with a light assisted decay of the single qubit, we also consider loss of atoms in the BEC. We show that the sensitivity of the metrology protocol is exponential in the decay rate, and we show a threshold value of the number of qubits below which the quantum advantage persists. Finally, we model external fluctuations of the field using a gaussian distribution. Like Markovian errors, we show a threshold for the number of qubits which scales inversely with the waist of the gaussian, below which the quantum advantage persists [2].
[1] H. Cable et al, Power of one bit of quantum information in quantum metrology, PRA, 93, 040304 (R)
[2] Philip Martin et al., Manuscript under preparation.
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