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Title: Preparation of metrological states in dipolar-interacting spin systems

Journal Article · · npj Quantum Information

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 spin ensembles with limited qubit control. For both regular and disordered spatial spin configurations the generated states enable sensing beyond the standard quantum limit (SQL) and, for small spin numbers, approach 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. The developed black-box optimization techniques for small spin numbers ( N  ≤ 10) are directly applicable to diamond-based nanoscale field sensing, where the sensor size limits N and conventional squeezing approaches fail.

Sponsoring Organization:
USDOE
Grant/Contract Number:
DOE 1F-60579, DE-AC02-06CH11357; DOE 1F-60579
OSTI ID:
1906415
Journal Information:
npj Quantum Information, Journal Name: npj Quantum Information Vol. 8 Journal Issue: 1; ISSN 2056-6387
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United Kingdom
Language:
English

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