On readout and initialisation fidelity by finite demolition single shot readout

Ideal projective quantum measurement makes the system state collapse in one of the observable operator eigenstates \(|\phi_\alpha\rangle\), making it a powerful tool for preparing the system in the desired pure state. Nevertheless, experimental realisations of projective measurement are not ideal. D...

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Bibliographic Details
Published inarXiv.org
Main Authors Zahedian, Majid, Keller, Max, Kwon, Minsik, Javadzade, Javid, Meinel, Jonas, Vorobyov, Vadim, Wrachtrup, Jörg
Format Paper
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 12.12.2022
Subjects
Accuracy
Color centers
Diamonds
Eigenvectors
Electron spin
Low temperature
Nuclear spin
Qubits (quantum computing)
Time measurement
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Summary:Ideal projective quantum measurement makes the system state collapse in one of the observable operator eigenstates \(|\phi_\alpha\rangle\), making it a powerful tool for preparing the system in the desired pure state. Nevertheless, experimental realisations of projective measurement are not ideal. During the measurement time needed to overcome the classical noise of the apparatus, the system state is often (slightly) perturbed, which compromises the fidelity of initialisation. In this paper, we propose an analytical model to analyse the initialisation fidelity of the system performed by the single-shot readout. We derive a method to optimise parameters for the three most used cases of photon counting based readouts for NV colour centre in diamond, charge state, nuclear spin and low temperature electron spin readout. Our work is of relevance for the accurate description of initialisation fidelity of the quantum bit when the single-shot readout is used for initialisation via post-selection or real-time control.
ISSN:2331-8422