SQuInT 2022 Program
Full Program | Thursday | Friday | Saturday | All Sessions | Posters | Talks
SESSION 2: Quantum sensing (Islands Ballroom)Chair: (Todd Brun (University Southern California)) | |
| 10:45 am - 11:30 am | Quntao Zhuang, University of Southern California (invited) Quantum metrology for dark matter search | Abstract. Quantum metrology is able to boost measurement precision in various applications. In this talk, I will use dark matter search as an example, to explain some ways how quantum sensing works and what advantages it can provide. I will start with an ultimate bound for noise sensing and its implication in dark matter search with microwave cavities - the ultimate limit of the 'scan-rate' given arbitrary input source and detection. Then I will talk about optimal schemes based on two-mode squeezing and a 'nulling' receiver. Afterwards, I will extend to an entangled sensor array (as axion wave length is huge), showing the boost of the scaling of scan-rate from coherent-signal processing and the joint noise suppression from multi-partite entanglement. Finally, I will discuss about generalization to opto-mechanical sensor arrays - for the detection of another hypothesis of dark matter called B-L model. |
| 11:30 am - 12:00 pm | Kianna Wan, Stanford University New bounds on adaptive quantum metrology under Markovian noise | Abstract. We analyse the problem of estimating a scalar parameter g that controls the Hamiltonian of a quantum system subject to Markovian noise. Specifically, we place bounds on the growth rate of the quantum Fisher information with respect to g, in terms of the Lindblad operators and the g-derivative of the Hamiltonian H. Our new bounds are not only more generally applicable than those in the literature---for example, they apply to systems with time-dependent Hamiltonians and/or Lindblad operators, and to infinite-dimensional systems such as oscillators---but are also tighter in the settings where previous bounds do apply. We derive our bounds directly from the master equation describing the system, without needing to discretize its time evolution. We also use our results to investigate how sensitive a single detection system can be to signals with different time dependences. We demonstrate that the sensitivity bandwidth is related to the quantum fluctuations of dH/dg, illustrating how "non-classical" states can enhance the range of signals that a system is sensitive to, even when they cannot increase its peak sensitivity. |
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SQuInT Chief Organizer
Akimasa Miyake, Associate Professor
amiyake@unm.edu
SQuInT Co-Organizer
Hartmut Haeffner, Associate Professor, UC Berkeley
hhaeffner@berkeley.edu
SQuInT Administrator
Dwight Zier
d29zier@unm.edu
505 277-1850
SQuInT Program Committee
Alberto Alonso, Postdoc, UC Berkeley
Philip Blocher, Postdoc, UNM
Neha Yadav, Postdoc, UC Berkeley
Cunlu Zhou, Postdoc, UNM
SQuInT Founder
Ivan Deutsch, Regents' Professor, CQuIC Director
ideutsch@unm.edu
