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12 results on '"A. Zibrov"'

11. Probing Johnson noise and ballistic transport in normal metals with a single-spin qubit

Author

Soonwon Choi, Vladimir Manucharyan, Hongkun Park, Shimon Kolkowitz, Mikhail D. Lukin, Alexander High, David Patterson, Alexander S. Zibrov, Quirin Unterreithmeier, Robert C. Devlin, and Arthur Safira

Subjects
Condensed Matter::Materials Science, Multidisciplinary, Condensed matter physics, Qubit, Ballistic conduction, engineering, Diamond, Johnson–Nyquist noise, Electron, engineering.material, Spin (physics), Electrical conductor, Magnetic field
Abstract

Thermally induced electrical currents, known as Johnson noise, cause fluctuating electric and magnetic fields in proximity to a conductor. These fluctuations are intrinsically related to the conductivity of the metal. We use single-spin qubits associated with nitrogen-vacancy centers in diamond to probe Johnson noise in the vicinity of conductive silver films. Measurements of polycrystalline silver films over a range of distances (20 to 200 nanometers) and temperatures (10 to 300 kelvin) are consistent with the classically expected behavior of the magnetic fluctuations. However, we find that Johnson noise is markedly suppressed next to single-crystal films, indicative of a substantial deviation from Ohm’s law at length scales below the electron mean free path. Our results are consistent with a generalized model that accounts for the ballistic motion of electrons in the metal, indicating that under the appropriate conditions, nearby electrodes may be used for controlling nanoscale optoelectronic, atomic, and solid-state quantum systems.

Published
2015
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12. Atomic Memory for Correlated Photon States.

Author

Wal, C. H. van der, Eisaman, M. D., André, A., Walsworth, R. L., Phillips, D. F., Zibrov, A. S., and Lukin, M. D.

Subjects
*LIGHT, *PHOTONS, *RUBIDIUM, *QUANTUM theory
Abstract

We experimentally demonstrate emission of two quantum-mechanicatly correlated light pulses with a time delay that is coherently controlled via temporal storage of photonic states in an ensemble of rubidium atoms. The experiment is based on Raman scattering, which produces correlated pairs of spin-flipped atoms and photons, followed by coherent conversion of the atomic states into a different photon beam after a controllable delay. This resonant nonlinear optical process is a promising technique for potential applications in quantum communication. [ABSTRACT FROM AUTHOR]

Published
2003
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