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Trapped Ion Quantum Computing

Quantum Critical Environment Assisted Quantum Magnetometer

arXiv
Authors: Noufal Jaseem, S. Omkar, Anil Shaji

Year

2017

Paper ID

44662

Status

Preprint

Abstract Read

~2 min

Abstract Words

124

Citations

N/A

Abstract

A central qubit coupled to an Ising ring of N qubits, operating close to a critical point is investigated as a potential precision quantum magnetometer for estimating an applied transverse magnetic field. We compute the Quantum Fisher information for the central, probe qubit with the Ising chain initialized in its ground state or in a thermal state. The non-unitary evolution of the central qubit due to its interaction with the surrounding Ising ring enhances the accuracy of the magnetic field measurement. Near the critical point of the ring, Heisenberg-like scaling of the precision in estimating the magnetic field is obtained when the ring is initialized in its ground state. However, for finite temperatures, the Heisenberg scaling is limited to lower ranges of N values.

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  • A central qubit coupled to an Ising ring of N qubits, operating close to a critical point is investigated as a potential precision quantum magnetometer for estimating an...

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References & Citation Signals

[1] DOI https://doi.org/arXiv:1707.03738 [2] arXiv https://arxiv.org/abs/1707.03738 [3] Publisher https://arxiv.org/abs/1707.03738

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