Circuit theory for decoherence in superconducting charge qubits

Burkard, Guido

Circuit theory for decoherence in superconducting charge qubits

Dateien

0408588v2.pdfGröße: 202.66 KBDownloads: 177

Datum

2005

Open Access-Veröffentlichung

Open Access Green

Sammlungen

Physik

Publikationstyp

Zeitschriftenartikel

Publikationsstatus

Published

Erschienen in

Physical Review. 2005(B71), 144511. Available under: doi: 10.1103/PhysRevB.71.144511

Zusammenfassung

Based on a network graph analysis of the underlying circuit, a quantum theory of arbitrary superconducting charge qubits is derived. Describing the dissipative elements of the circuit with a Caldeira-Leggett model, we calculate the decoherence and leakage rates of a charge qubit. The analysis includes decoherence due to a dissipative circuit element such as a voltage source or the quasiparticle resistances of the Josephson junctions in the circuit. The theory presented here is dual to the quantum circuit theory for superconducting flux qubits. In contrast to spin-boson models, the full Hilbert space structure of the qubit and its coupling to the dissipative environment is taken into account. Moreover, both self and mutual inductances of the circuit are fully included.

Fachgebiet (DDC)

530 Physik

Zitieren

ISO 690

BURKARD, Guido, 2005. Circuit theory for decoherence in superconducting charge qubits. In: Physical Review. 2005(B71), 144511. Available under: doi: 10.1103/PhysRevB.71.144511

BibTex

@article{Burkard2005Circu-4993,
  year={2005},
  doi={10.1103/PhysRevB.71.144511},
  title={Circuit theory for decoherence in superconducting charge qubits},
  number={B71},
  journal={Physical Review},
  author={Burkard, Guido},
  note={Article Number: 144511}
}

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    <dcterms:abstract xml:lang="eng">Based on a network graph analysis of the underlying circuit, a quantum theory of arbitrary superconducting charge qubits is derived. Describing the dissipative elements of the circuit with a Caldeira-Leggett model, we calculate the decoherence and leakage rates of a charge qubit. The analysis includes decoherence due to a dissipative circuit element such as a voltage source or the quasiparticle resistances of the Josephson junctions in the circuit. The theory presented here is dual to the quantum circuit theory for superconducting flux qubits. In contrast to spin-boson models, the full Hilbert space structure of the qubit and its coupling to the dissipative environment is taken into account. Moreover, both self and mutual inductances of the circuit are fully included.</dcterms:abstract>
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Universitätsbibliographie

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