Precision requirements for spin-echo-based quantum memories

Journal Article · Tue Mar 15 00:00:00 EDT 2011 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.83.032315· OSTI ID:21537410

Heshami, Khabat; Simon, Christoph ^[1]; Sangouard, Nicolas; Minar, Jiri ^[2]; Riedmatten, Hugues de ^[3]

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1. Institute for Quantum Information Science and Department of Physics and Astronomy, University of Calgary, Calgary, Alberta, T2N 1N4 (Canada)
2. Group of Applied Physics, University of Geneva, CH-1211 Geneva (Switzerland)
3. ICFO-Institute of Photonic Sciences, Mediterranean Technology Park, ES-08860 Castelldefels (Barcelona) (Spain)

Spin-echo techniques are essential for achieving long coherence times in solid-state quantum memories for light because of inhomogeneous broadening of the spin transitions. It has been suggested that unrealistic levels of precision for the radio-frequency control pulses would be necessary for successful decoherence control at the quantum level. Here we study the effects of pulse imperfections in detail, using both a semiclassical and a fully quantum-mechanical approach. Our results show that high efficiencies and low noise-to-signal ratios can be achieved for the quantum memories in the single-photon regime for realistic levels of control pulse precision. We also analyze errors due to imperfect initial-state preparation (optical pumping), showing that they are likely to be more important than control pulse errors in many practical circumstances. These results are crucial for future developments of solid-state quantum memories.

• OSTI ID: 21537410
• Journal Information: Physical Review. A, Vol. 83, Issue 3; Other Information: DOI: 10.1103/PhysRevA.83.032315; (c) 2011 American Institute of Physics; ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ACCURACY
CONTROL
EFFICIENCY
ERRORS
OPTICAL PUMPING
PHOTONS
PULSES
QUANTUM MECHANICS
RADIOWAVE RADIATION
SEMICLASSICAL APPROXIMATION
SIGNAL-TO-NOISE RATIO
SOLIDS
SPIN
SPIN ECHO
ANGULAR MOMENTUM
APPROXIMATIONS
BOSONS
CALCULATION METHODS
DIMENSIONLESS NUMBERS
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
MASSLESS PARTICLES
MECHANICS
PARTICLE PROPERTIES
PUMPING
RADIATIONS