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Controlling the Effective Hamiltonian of a Driven Quantum Superconducting Circuit.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Controlling the Effective Hamiltonian of a Driven Quantum Superconducting Circuit./
作者:	Venkatraman, Jayameenakshi.
面頁冊數:	1 online resource (189 pages)
附註:	Source: Dissertations Abstracts International, Volume: 85-01, Section: B.
Contained By:	Dissertations Abstracts International85-01B.
標題:	Physics. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30312686click for full text (PQDT)
ISBN:	9798379781941

Controlling the Effective Hamiltonian of a Driven Quantum Superconducting Circuit.
Venkatraman, Jayameenakshi.

Controlling the Effective Hamiltonian of a Driven Quantum Superconducting Circuit. - 1 online resource (189 pages)

Source: Dissertations Abstracts International, Volume: 85-01, Section: B.

Thesis (Ph.D.)--Yale University, 2023.

Includes bibliographical references

Can we observe and control the quantum manifestations of an effective Hamiltonian in a superconducting circuit submitted to a fast-oscillating driving force? We have implemented the effective Hamiltonian of a Kerr oscillator submitted to a squeezing drive in a Josephson tunnel junction-based quantum superconducting circuit submitted to a microwave sinusoidal driving excitation. We experimentally measure pairwise simultaneous degeneracies in the spectrum of this effective Hamiltonian, which models a quantum double well. What underlies these simultaneous degeneracies is the unusual destructive interference of tunnel paths in the classically forbidden region, an effect revealing a hidden symmetry of the system. Not only can these degeneracies be turned on-and-off on demand, but their number is tunable: when the detuning ∆ of the drive's second subharmonic from the oscillator frequency equals an even multiple of the Kerr coefficient K, ∆/K = 2m, the oscillator experiences m+1 exact spectral degeneracies. Importantly, these degeneracies are robust as they are completely independent of the drive amplitude. They also lead to a drastic reduction of the incoherent well-switching rate leading to our realization of a super-protected cat qubit. Our work indicates the circumstances by which the control of parametric processes via the drive frequency can provide a practical new tool for quantum technologies. Underlying this experiment is a calculation tool to transform-beyond the rotating-wave approximation-a time-dependent Hamiltonian describing a superconducting nonlinear circuit submitted to a fast-oscillating driving force to a time-independent effective Hamiltonian governing the dynamics of our quantum double-well system.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2023

Mode of access: World Wide Web

ISBN: 9798379781941Subjects--Topical Terms:

516296
Physics.
Subjects--Index Terms:

Effective hamiltoniansIndex Terms--Genre/Form:

542853
Electronic books.

Controlling the Effective Hamiltonian of a Driven Quantum Superconducting Circuit.
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504 $a Includes bibliographical references
520 $a Can we observe and control the quantum manifestations of an effective Hamiltonian in a superconducting circuit submitted to a fast-oscillating driving force? We have implemented the effective Hamiltonian of a Kerr oscillator submitted to a squeezing drive in a Josephson tunnel junction-based quantum superconducting circuit submitted to a microwave sinusoidal driving excitation. We experimentally measure pairwise simultaneous degeneracies in the spectrum of this effective Hamiltonian, which models a quantum double well. What underlies these simultaneous degeneracies is the unusual destructive interference of tunnel paths in the classically forbidden region, an effect revealing a hidden symmetry of the system. Not only can these degeneracies be turned on-and-off on demand, but their number is tunable: when the detuning ∆ of the drive's second subharmonic from the oscillator frequency equals an even multiple of the Kerr coefficient K, ∆/K = 2m, the oscillator experiences m+1 exact spectral degeneracies. Importantly, these degeneracies are robust as they are completely independent of the drive amplitude. They also lead to a drastic reduction of the incoherent well-switching rate leading to our realization of a super-protected cat qubit. Our work indicates the circumstances by which the control of parametric processes via the drive frequency can provide a practical new tool for quantum technologies. Underlying this experiment is a calculation tool to transform-beyond the rotating-wave approximation-a time-dependent Hamiltonian describing a superconducting nonlinear circuit submitted to a fast-oscillating driving force to a time-independent effective Hamiltonian governing the dynamics of our quantum double-well system.
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653 $a Quantum information
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