Energetic suppression of decoherence in exchange-only quantum computation

Journal Article · Mon Aug 15 04:00:00 EDT 2005 · Physical Review. A

DOI:https://doi.org/10.1103/PhysRevA.72.022319· OSTI ID:20718078

Weinstein, Yaakov S; Hellberg, C Stephen ^[1]

---

1. Center for Computational Materials Science, Naval Research Laboratory, Washington, DC 20375 (United States)

Universal quantum computation requiring only the Heisenberg exchange interaction and suppressing decoherence via an energy gap is presented. The combination of an always-on exchange interaction between the three physical qubits comprising the encoded qubit and a global magnetic field generates an energy gap between the subspace of interest and all other states. This energy gap suppresses decoherence. Always-on exchange couplings greatly simplify hardware specifications and the implementation of inter-logical-qubit gates. A controlled phase gate can be implemented using only three Heisenberg exchange operations all of which can be performed simultaneously.0.

• OSTI ID: 20718078
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 2 Vol. 72; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
74 ATOMIC AND MOLECULAR PHYSICS
COUPLING
ENERGY GAP
ENERGY LEVELS
EXCHANGE INTERACTIONS
HEISENBERG MODEL
IMPLEMENTATION
INFORMATION THEORY
MAGNETIC FIELDS
QUANTUM COMPUTERS
QUBITS