Preparing Dicke states in a spin ensemble using phase estimation

Journal article (2021)

Authors

Y. Wang QCD/Terhal Group - QuTech Advanced Research Centre
B.M. Terhal QCD/Terhal Group - QuTech Advanced Research Centre , Forschungszentrum Jülich, QCD/Terhal Group - QuTech Advanced Research Centre
Research Group
QCD/Terhal Group (QuTech Advanced Research Centre) (TU Delft)
Copyright: © 2021 Y. Wang, B.M. Terhal
DOI
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https://doi.org/10.1103/PhysRevA.104.032407
More Info
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Published Date

2021

Language

English

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Faculty

QuTech Advanced Research Centre

Department

Quantum Computing Division

Research Group

QCD/Terhal Group

Abstract

We present a Dicke state preparation scheme which uses global control of N spin qubits: our scheme is based on the standard phase estimation algorithm, which estimates the eigenvalue of a unitary operator. The scheme prepares a Dicke state nondeterministically by collectively coupling the spins to an ancilla qubit via a ZZ interaction, using log2N+1 ancilla qubit measurements. The preparation of such Dicke states can be useful if the spins in the ensemble are used for magnetic sensing: we discuss a possible realization using an ensemble of electronic spins located at diamond nitrogen-vacancy centers coupled to a single superconducting flux qubit. We also analyze the effect of noise and limitations in our scheme.