Andreev Interferometry of Flux Qubits Driven By Radio Frequency Field. / Checkley, Chris.

2009. 150 p.

Research output: ThesisDoctoral Thesis

Unpublished

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Andreev Interferometry of Flux Qubits Driven By Radio Frequency Field. / Checkley, Chris.

2009. 150 p.

Research output: ThesisDoctoral Thesis

Harvard

APA

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Author

BibTeX

@phdthesis{465a61490041402d9ba395874484567e,
title = "Andreev Interferometry of Flux Qubits Driven By Radio Frequency Field",
abstract = "In this thesis we present the continuing work done examining a system inwhich an Andreev interferometer is used to probe the state of a flux qubit.In particular, we show that the back action of the interferometer on thequbit is low enough that an energy gap can still be observed in the qubit,and present the first experimental evidence of resonant excitation of a fluxqubit detected using an Andreev interferometer.We begin by discussing the theory of flux qubits and Andreev interferometersindividually. We then go on to examine what happens when withthese two types of structures are combined, with particular attention beingpaid to the consequences for the coherence time of the qubit.We then discuss the practical elements of the experiment, notably thedevelopment of a tri-layer resists system that can be used to create highquality mesoscopic structures.We present the experimental results, which show the evidence for resonantexcitation of a qubit detected using an Andreev interferometer. The qualityof these resonances suggests that the system has a coherence time of lessthan 1ns.To conclude we examine some ways in which we believe the system canbe improved in order to allow more detailed spectroscopic and time resolvedmeasurements.",
author = "Chris Checkley",
year = "2009",
language = "English",
school = "Royal Holloway, University of London",

}

RIS

TY - THES

T1 - Andreev Interferometry of Flux Qubits Driven By Radio Frequency Field

AU - Checkley, Chris

PY - 2009

Y1 - 2009

N2 - In this thesis we present the continuing work done examining a system inwhich an Andreev interferometer is used to probe the state of a flux qubit.In particular, we show that the back action of the interferometer on thequbit is low enough that an energy gap can still be observed in the qubit,and present the first experimental evidence of resonant excitation of a fluxqubit detected using an Andreev interferometer.We begin by discussing the theory of flux qubits and Andreev interferometersindividually. We then go on to examine what happens when withthese two types of structures are combined, with particular attention beingpaid to the consequences for the coherence time of the qubit.We then discuss the practical elements of the experiment, notably thedevelopment of a tri-layer resists system that can be used to create highquality mesoscopic structures.We present the experimental results, which show the evidence for resonantexcitation of a qubit detected using an Andreev interferometer. The qualityof these resonances suggests that the system has a coherence time of lessthan 1ns.To conclude we examine some ways in which we believe the system canbe improved in order to allow more detailed spectroscopic and time resolvedmeasurements.

AB - In this thesis we present the continuing work done examining a system inwhich an Andreev interferometer is used to probe the state of a flux qubit.In particular, we show that the back action of the interferometer on thequbit is low enough that an energy gap can still be observed in the qubit,and present the first experimental evidence of resonant excitation of a fluxqubit detected using an Andreev interferometer.We begin by discussing the theory of flux qubits and Andreev interferometersindividually. We then go on to examine what happens when withthese two types of structures are combined, with particular attention beingpaid to the consequences for the coherence time of the qubit.We then discuss the practical elements of the experiment, notably thedevelopment of a tri-layer resists system that can be used to create highquality mesoscopic structures.We present the experimental results, which show the evidence for resonantexcitation of a qubit detected using an Andreev interferometer. The qualityof these resonances suggests that the system has a coherence time of lessthan 1ns.To conclude we examine some ways in which we believe the system canbe improved in order to allow more detailed spectroscopic and time resolvedmeasurements.

M3 - Doctoral Thesis

ER -