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Design of Protected Superconducting ...

Smith, William Clarke.

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Design of Protected Superconducting Qubits.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Design of Protected Superconducting Qubits./
Author:	Smith, William Clarke.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2019,
Description:	204 p.
Notes:	Source: Dissertations Abstracts International, Volume: 81-10, Section: B.
Contained By:	Dissertations Abstracts International81-10B.
Subject:	Quantum physics. -
Online resource:	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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100 1 $a Smith, William Clarke. $3 3550184
245 1 0 $a Design of Protected Superconducting Qubits.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2019
300 $a 204 p.
500 $a Source: Dissertations Abstracts International, Volume: 81-10, Section: B.
500 $a Advisor: Devoret, Michel H.
502 $a Thesis (Ph.D.)--Yale University, 2019.
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.
590 $a School code: 0265.
650 4 $a Quantum physics. $3 726746
650 4 $a Condensed matter physics. $3 3173567
653 $a Protected superconducting qubits
690 $a 0599
690 $a 0611
710 2 $a Yale University. $b Physics. $3 2101654
773 0 $t Dissertations Abstracts International $g 81-10B.
790 $a 0265
791 $a Ph.D.
792 $a 2019
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=22618103