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Design of Protected Superconducting ...

Smith, William Clarke.

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Design of Protected Superconducting Qubits.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Design of Protected Superconducting Qubits./
作者:	Smith, William Clarke.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2019,
面頁冊數:	204 p.
附註:	Source: Dissertations Abstracts International, Volume: 81-10, Section: B.
Contained By:	Dissertations Abstracts International81-10B.
標題:	Quantum physics. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=22618103
ISBN:	9798607312664

Design of Protected Superconducting Qubits.
Smith, William Clarke.

Design of Protected Superconducting Qubits. - Ann Arbor : ProQuest Dissertations & Theses, 2019 - 204 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.

Controllable quantum systems that are shielded at the Hamiltonian level from the random fluctuations of their environments could provide a valuable resource for quantum information science. While these "protected qubits" promise unprecedentedly low error rates, this might come at the expense of ease of physical implementation. This thesis focuses on overcoming this apparent design problem in protected qubits within the context of superconducting circuits and their quantized electromagnetic fields. We describe the essential design tools: quantization of nonlinear lumped element circuits, approximation by an effective Hamiltonian, numerical diagonalization to compute energy levels and matrix elements, Hamiltonian verification via spectroscopy, and noise characterization using time-domain measurements. At each stage, examples are given from the following systems: the fluxonium artificial atom, the double fluxonium artificial molecule, and our candidate protected qubit---the cos2φ qubit. We validate the principle of designed protection, with numerical predictions of the insensitivity of the cos2φ qubit to all expected decoherence mechanisms, and describe the current experimental status.

ISBN: 9798607312664Subjects--Topical Terms:

726746
Quantum physics.
Subjects--Index Terms:

Protected superconducting qubits

Design of Protected Superconducting Qubits.
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500 $a Advisor: Devoret, Michel H.
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506 $a This item must not be sold to any third party vendors.
520 $a Controllable quantum systems that are shielded at the Hamiltonian level from the random fluctuations of their environments could provide a valuable resource for quantum information science. While these "protected qubits" promise unprecedentedly low error rates, this might come at the expense of ease of physical implementation. This thesis focuses on overcoming this apparent design problem in protected qubits within the context of superconducting circuits and their quantized electromagnetic fields. We describe the essential design tools: quantization of nonlinear lumped element circuits, approximation by an effective Hamiltonian, numerical diagonalization to compute energy levels and matrix elements, Hamiltonian verification via spectroscopy, and noise characterization using time-domain measurements. At each stage, examples are given from the following systems: the fluxonium artificial atom, the double fluxonium artificial molecule, and our candidate protected qubit---the cos2φ qubit. We validate the principle of designed protection, with numerical predictions of the insensitivity of the cos2φ qubit to all expected decoherence mechanisms, and describe the current experimental status.
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650 4 $a Condensed matter physics. $3 3173567
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773 0 $t Dissertations Abstracts International $g 81-10B.
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793 $a English
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