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Optimal tuning of solid-state quantum gates: A universal two-qubit gate

Source: Phys. Rev. B 81, 052502 (2010); doi:10.1103/PhysRevB.81.052502

Published 9 February 2010

PACS
  • 85.25.-j
    Superconducting devices
  • 03.67.Lx
    Quantum computation architectures and implementations
  • 03.65.Yz
    Decoherence; open systems; quantum statistical methods
  • 05.40.-a
    Fluctuation phenomena, random processes, noise, and Brownian motion
  • YEAR: 2010
PUBLICATION DATA
Publisher:
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E. Paladino,1,2 A. Mastellone,3,1,2 A. D'Arrigo,1,2 and G. Falci1,2
1Dipartimento di Metodologie Fisiche e Chimiche (DMFCI), Università di Catania, Viale A. Doria 6, 95125 Catania, Italy
2MATIS CNR-INFM, Catania, Italy
3Centro Italiano Ricerche Aerospaziali (CIRA), Via Maiorise snc, Capua, 81043 Caserta, Italy
We present a general route to reduce inhomogeneous broadening in nanodevices due to 1/f noise. We apply this method to a universal two-qubit gate and demonstrate that for selected optimal couplings, a high-efficient gate can be implemented even in the presence of 1/f noise. Entanglement degradation due to interplay of 1/f and quantum noise is quantified via the concurrence. A charge-phase sqrt(i - SWAP) gate for spectra extrapolated from single-qubit experiments is analyzed. ©2010 The American Physical Society
History: Received 12 June 2009; revised 5 December 2009; published 9 February 2010
Permalink: http://link.aps.org/abstract/PRB/v81/e052502
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