Dressed qubits in nuclear spin baths

Journal Article · Thu Apr 15 04:00:00 EDT 2010 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.81.044305· OSTI ID:21408747

Lianao, Wu ^[1]

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1. Department of Theoretical Physics and History of Science, Basque Country University (EHU/UPV), Post Office Box 644, ES-48080 Bilbao (Spain) and IKERBASQUE, Basque Foundation for Science, ES-48011 Bilbao (Spain)

We present a method to encode a dressed qubit into the product state of an electron spin localized in a quantum dot and its surrounding nuclear spins via a dressing transformation. In this scheme, the hyperfine coupling and a portion of a nuclear dipole-dipole interaction become logic gates, while they are the sources of decoherence in electron-spin qubit proposals. We discuss errors and corrections for the dressed qubits. Interestingly, the effective Hamiltonian of nuclear spins is equivalent to a pairing Hamiltonian, which provides the microscopic mechanism to protect dressed qubits against decoherence.

• OSTI ID: 21408747
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 4 Vol. 81; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
74 ATOMIC AND MOLECULAR PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANGULAR MOMENTUM
CORRECTIONS
COUPLING
DIPOLES
ELECTRONS
ELEMENTARY PARTICLES
ERRORS
FERMIONS
HAMILTONIANS
INFORMATION
INTERACTIONS
LEPTONS
MATHEMATICAL OPERATORS
MULTIPOLES
NANOSTRUCTURES
PARTICLE PROPERTIES
QUANTUM DOTS
QUANTUM INFORMATION
QUANTUM OPERATORS
QUBITS
SPIN