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Quantum Measurements of Microwave-Fr...

Chou, Ming-Han,

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Quantum Measurements of Microwave-Frequency Acoustic Resonators with Superconducting Circuits /

Record Type:	Electronic resources : Monograph/item
Title/Author:	Quantum Measurements of Microwave-Frequency Acoustic Resonators with Superconducting Circuits // Ming-Han Chou.
Author:	Chou, Ming-Han,
Description:	1 electronic resource (126 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 84-09, Section: B.
Contained By:	Dissertations Abstracts International84-09B.
Subject:	Physics. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=29396606
ISBN:	9798377640387

Quantum Measurements of Microwave-Frequency Acoustic Resonators with Superconducting Circuits /
Chou, Ming-Han,

Quantum Measurements of Microwave-Frequency Acoustic Resonators with Superconducting Circuits /Ming-Han Chou. - 1 electronic resource (126 pages)

Source: Dissertations Abstracts International, Volume: 84-09, Section: B.

Phonon modes at microwave frequencies can be cooled to their quantum ground state using conventional cryogenic refrigeration, providing a convenient way to study and manipulate quantum states at the single phonon level. Phonons are of particular interest because mechanical deformations can mediate interactions with a wide range of different quantum systems, including solid-state defects, superconducting qubits, and optical photons when using optomechanically active constructs. Phonons, thus, hold promise for quantum-focused applications as diverse as sensing, information processing, and communication. In this thesis, we describe a piezoelectric quantum bulk acoustic resonator with a 4.88 GHz resonant frequency, which, at cryogenic temperatures, displays large electromechanical coupling strength combined with a high intrinsic mechanical quality factor Qi ∼ 4.3 * 104. Using a recently developed flip-chip technique, we couple this resonator to a superconducting qubit on a separate die and demonstrate the quantum control of the mechanics in the coupled system. The resonator lifetime at a single phonon level is measured, which yields a Qi ∼ 5.43 * 103. This lower quality factor at a single phonon level is likely due to the two-level system (TLS) defects contamination in the device. To test whether this dissipation comes from the TLS defects, a hole-burning technique is implemented to saturate those defects. As a result, the resonator quality factor is enhanced back to Qi ∼ 3 * 104, which demonstrates that TLS defects contribute the dissipation significantly in our device.

English

ISBN: 9798377640387Subjects--Topical Terms:

516296
Physics.
Subjects--Index Terms:

Acoustics

Quantum Measurements of Microwave-Frequency Acoustic Resonators with Superconducting Circuits /
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520 $a Phonon modes at microwave frequencies can be cooled to their quantum ground state using conventional cryogenic refrigeration, providing a convenient way to study and manipulate quantum states at the single phonon level. Phonons are of particular interest because mechanical deformations can mediate interactions with a wide range of different quantum systems, including solid-state defects, superconducting qubits, and optical photons when using optomechanically active constructs. Phonons, thus, hold promise for quantum-focused applications as diverse as sensing, information processing, and communication. In this thesis, we describe a piezoelectric quantum bulk acoustic resonator with a 4.88 GHz resonant frequency, which, at cryogenic temperatures, displays large electromechanical coupling strength combined with a high intrinsic mechanical quality factor Qi ∼ 4.3 * 104. Using a recently developed flip-chip technique, we couple this resonator to a superconducting qubit on a separate die and demonstrate the quantum control of the mechanics in the coupled system. The resonator lifetime at a single phonon level is measured, which yields a Qi ∼ 5.43 * 103. This lower quality factor at a single phonon level is likely due to the two-level system (TLS) defects contamination in the device. To test whether this dissipation comes from the TLS defects, a hole-burning technique is implemented to saturate those defects. As a result, the resonator quality factor is enhanced back to Qi ∼ 3 * 104, which demonstrates that TLS defects contribute the dissipation significantly in our device.
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653 $a Microwave
653 $a Quantum computer
653 $a Qubit
653 $a Resonator
653 $a Superconducting circuits
690 $a 0605
690 $a 0599
690 $a 0611
710 2 $a The University of Chicago. $b Physics. $e degree granting institution. $3 3823771
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