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Nonequilibrium Quasiparticles in Sup...

Serniak, Kyle.

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Nonequilibrium Quasiparticles in Superconducting Qubits.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Nonequilibrium Quasiparticles in Superconducting Qubits./
作者:	Serniak, Kyle.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2019,
面頁冊數:	194 p.
附註:	Source: Dissertations Abstracts International, Volume: 81-10, Section: B.
Contained By:	Dissertations Abstracts International81-10B.
標題:	Applied physics. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=22584995
ISBN:	9798607313012

Nonequilibrium Quasiparticles in Superconducting Qubits.
Serniak, Kyle.

Nonequilibrium Quasiparticles in Superconducting Qubits. - Ann Arbor : ProQuest Dissertations & Theses, 2019 - 194 p.

Source: Dissertations Abstracts International, Volume: 81-10, Section: B.

Thesis (Ph.D.)--Yale University, 2019.

This item must not be sold to any third party vendors.

Nonequilibrium quasiparticle excitations (QPs) can constitute a significant source of dissipation in superconducting quantum devices. Surprisingly, the precise mechanisms by which these QPs are generated are to this day unknown. This dissertation describes our recent work seeking to understand the dynamics of nonequilibrium QPs and the limits they impose on the coherence of superconducting qubits. In the popular transmon qubit, QPs can cause dissipation when they tunnel across the Josephson junction of the circuit. Our experiments have focused on detecting changes in the charge-parity of offset-charge-sensitive transmon qubits: a signature of these QP tunneling events. Specifically, we extract QP-induced relaxation and excitation rates by correlating changes in the charge parity of the device with transitions between qubit states. This is achieved both by coherent mapping of charge parity onto the qubit state and by direct-dispersive detection of the joint qubit and charge-parity state. We find that QP-induced dissipation can be on equal footing with all other loss mechanisms and that QPs can be the dominant source of residual qubit excited-state population. Additionally, we have identified another mechanism that can induce both dissipation and charge parity switches, namely photon-assisted QP generation and tunneling (PAT) processes. Finally, we demonstrated that improved high-frequency RF filtering can significantly attenuate QP generating radiation, extending the energy relaxation time of transmon that was previously limited by QP-related processes by a factor of two.

ISBN: 9798607313012Subjects--Topical Terms:

3343996
Applied physics.
Subjects--Index Terms:

Mesoscopic physics

Nonequilibrium Quasiparticles in Superconducting Qubits.
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520 $a Nonequilibrium quasiparticle excitations (QPs) can constitute a significant source of dissipation in superconducting quantum devices. Surprisingly, the precise mechanisms by which these QPs are generated are to this day unknown. This dissertation describes our recent work seeking to understand the dynamics of nonequilibrium QPs and the limits they impose on the coherence of superconducting qubits. In the popular transmon qubit, QPs can cause dissipation when they tunnel across the Josephson junction of the circuit. Our experiments have focused on detecting changes in the charge-parity of offset-charge-sensitive transmon qubits: a signature of these QP tunneling events. Specifically, we extract QP-induced relaxation and excitation rates by correlating changes in the charge parity of the device with transitions between qubit states. This is achieved both by coherent mapping of charge parity onto the qubit state and by direct-dispersive detection of the joint qubit and charge-parity state. We find that QP-induced dissipation can be on equal footing with all other loss mechanisms and that QPs can be the dominant source of residual qubit excited-state population. Additionally, we have identified another mechanism that can induce both dissipation and charge parity switches, namely photon-assisted QP generation and tunneling (PAT) processes. Finally, we demonstrated that improved high-frequency RF filtering can significantly attenuate QP generating radiation, extending the energy relaxation time of transmon that was previously limited by QP-related processes by a factor of two.
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