Preparation of Metrological States in Dipolar-Interacting Spin Systems
- URL: http://arxiv.org/abs/2203.03084v1
- Date: Mon, 7 Mar 2022 01:02:47 GMT
- Title: Preparation of Metrological States in Dipolar-Interacting Spin Systems
- Authors: Tian-Xing Zheng, Anran Li, Jude Rosen, Sisi Zhou, Martin
Koppenh\"ofer, Ziqi Ma, Frederic T. Chong, Aashish A. Clerk, Liang Jiang,
Peter C. Maurer
- Abstract summary: We develop a variational method to generate metrological states in small dipolar-interacting ensembles.
The generated states enable sensing beyond the standard quantum limit.
- Score: 4.692605303749971
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Spin systems are an attractive candidate for quantum-enhanced metrology. Here
we develop a variational method to generate metrological states in small
dipolar-interacting ensembles with limited qubit controls and unknown spin
locations. The generated states enable sensing beyond the standard quantum
limit (SQL) and approaching the Heisenberg limit (HL). Depending on the circuit
depth and the level of readout noise, the resulting states resemble
Greenberger-Horne-Zeilinger (GHZ) states or Spin Squeezed States (SSS). Sensing
beyond the SQL holds in the presence of finite spin polarization and a
non-Markovian noise environment.
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