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Application of phase estimation algorithms to improve diamond spin magnetometry

Nusran, Naufer (2014) Application of phase estimation algorithms to improve diamond spin magnetometry. Doctoral Dissertation, University of Pittsburgh. (Unpublished)

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Precision measurements of weak magnetic fields with nanoscale spatial resolution is an outstanding challenge in many fields including medicine, biology, material science and physical science. It has already been demonstrated that a single electronic spin formed by a defect color center in diamond, known as the nitrogen-vacancy (NV) center, can serve as a highly sensitive magnetometer with nanoscale resolution, even under ambient conditions. However, standard quantum sensing methods have significant drawbacks. These include the limited dynamic range due to quantum phase ambiguity, the non-linearity in sensitivity over the detectable field range, the requirement of prior knowledge of a working point for accurate deconvolution, etc.
This thesis explores novel quantum control techniques such as the use of phase estimation algorithms (PEA) for magnetic field detection to address these issues. Unlike in the standard approach, PEA readout is linearly dependent on the field being sensed. PEA employed on oscillating (AC) magnetic fields can not only detect unknown field amplitudes but also allows detection of the field phase. The thesis also compares the performance of nonadaptive-PEA (NAPEA) with that of adaptive-PEA (QPEA) and conclude that NAPEA is superior to QPEA due to (a) better sensitivity on average, (b) consistency in sensitivity throughout the full field range, (c) comparatively less demanding measurement fidelity, and (d) for simplicity in its experimental realization. The techniques developed here can potentially have broad applicability to a wide variety of solid-state quantum systems and in the field of quantum control and measurement.


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Item Type: University of Pittsburgh ETD
Status: Unpublished
CreatorsEmailPitt UsernameORCID
Nusran, Naufer nmn6@pitt.eduNMN6
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairDutt, Gurudevgdutt@pitt.eduGDUTT
Committee MemberD'Urso, Briandursobr@pitt.eduDURSOBR
Committee MemberShepard, Paulshepard@pitt.eduSHEPARD
Committee MemberCoalson, RobertCOALSON@pitt.eduCOALSON
Committee MemberGriffiths,
Date: 29 May 2014
Date Type: Publication
Defense Date: 24 February 2014
Approval Date: 29 May 2014
Submission Date: 12 April 2014
Access Restriction: No restriction; Release the ETD for access worldwide immediately.
Number of Pages: 137
Institution: University of Pittsburgh
Schools and Programs: Dietrich School of Arts and Sciences > Physics
Degree: PhD - Doctor of Philosophy
Thesis Type: Doctoral Dissertation
Refereed: Yes
Uncontrolled Keywords: nanoscale magnetometry, nitrogen-vacancy, phase estimation algorithm
Date Deposited: 29 May 2014 22:15
Last Modified: 15 Nov 2016 14:19


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