Physical Sciences Division
Published December 22, 2022 | Version v1
Journal article Open

Preparation of metrological states in dipolar-interacting spin systems

Creators

  • 1. University of Chicago

Description

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.

Data availability

All relevant data supporting the main conclusions and figures of the document are available from the corresponding author on reasonable request.

All relevant code is available from the corresponding author upon reasonable request.

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Additional details

Identifiers

DOI
10.1038/s41534-022-00667-4
Other
oai:uchicago.tind.io:11721

Related works

Is supplement to
https://doi.org/10.1038/s41534-024-00843-8 (URL)

Funding

National Science Foundation
OMA-1936118
National Science Foundation
OIA-2040520
National Science Foundation
QuBBE QLCI
National Science Foundation
Institute for Quantum Information and Matter
National Science Foundation
EPiQC
National Science Foundation
EPiQC
National Science Foundation
STAQ
U.S. Department of Energy
Office of Advanced Scientific Computing Research, Accelerated Research for Quantum Computing Program
National Science Foundation
OMA-2016136

UChicago Information

Division(s)
Physical Sciences Division, Pritzker School of Molecular Engineering
Department(s)
Computer Science, Physics