Published September 2006
| Version v1
Journal article
Quantum measurement of a mesoscopic spin ensemble
- 1. Max-Planck-Institut fuer Quantenoptik, H.-Kopfermann-Str., 85748 Garching (Germany)
- 2. Institut fuer Quantenelektronik, ETH Zuerich, Wolfgang-Pauli-Strasse 16, 8093 Zurich (Switzerland)
- 3. Department of Physics, Harvard University, Cambridge, Massachusetts 02138 (United States)
- 4. Department of Mathematics, Iowa State University, Ames, Iowa 50011 (United States)
Description
We describe a method for precise estimation of the polarization of a mesoscopic spin ensemble by using its coupling to a single two-level system. Our approach requires a minimal number of measurements on the two-level system for a given measurement precision. We consider the application of this method to the case of nuclear-spin ensemble defined by a single electron-charged quantum dot: we show that decreasing the electron spin dephasing due to nuclei and increasing the fidelity of nuclear-spin-based quantum memory could be within the reach of present day experiments
Additional details
Identifiers
- DOI
- 10.1103/PhysRevA.74.032316;
- arXiv
- arXiv:quant-ph/0508144v3;
Publishing Information
- Journal Title
- Physical Review. A
- Journal Volume
- 74
- Journal Issue
- 3
- Journal Page Range
- p. 032316-032316.8
- ISSN
- 1050-2947
- CODEN
- PLRAAN
INIS
- Country of Publication
- United States
- Country of Input or Organization
- International Atomic Energy Agency (IAEA)
- INIS RN
- 38029849
- Subject category
- S74: ATOMIC AND MOLECULAR PHYSICS; S71: CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; S75: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY;
- Descriptors DEI
- ACCURACY; COUPLING; ELECTRONS; ENERGY LEVELS; POLARIZATION; QUANTUM DOTS; SPIN
- Descriptors DEC
- ANGULAR MOMENTUM; ELEMENTARY PARTICLES; FERMIONS; LEPTONS; NANOSTRUCTURES; PARTICLE PROPERTIES
Optional Information
- Notes
- (c) 2006 The American Physical Society