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Now showing items 61-70 of 179
Environment-Assisted Precision Measurement
(American Physical Society, 2011)
We describe a method to enhance the sensitivity of precision measurements that takes advantage of the environment of a quantum sensor to amplify the response of the sensor to weak external perturbations. An individual qubit ...
Coherence And Control Of Quantum Registers Based On Electronic Spin In A Nuclear Spin Bath
(American Physical Society, 2009)
We consider a protocol for the control of few-qubit registers comprising one electronic spin embedded in a nuclear spin bath. We show how to isolate a few proximal nuclear spins from the rest of the bath and use them as ...
Tunable Superfluidity and Quantum Magnetism with Ultracold Polar Molecules
(American Physical Society, 2011)
By selecting two dressed rotational states of ultracold polar molecules in an optical lattice, we obtain a highly tunable generalization of the \(t-J\) model, which we refer to as the \(t-J-V-W\) model. In addition to XXZ ...
Adiabatic Preparation of Many-Body States in Optical Lattices
(American Physical Society, 2010)
We analyze a technique for the preparation of low-entropy many-body states of atoms in optical lattices based on adiabatic passage. In particular, we show that this method allows preparation of strongly correlated states ...
Photon Sorters and QND Detectors Using Single Photon Emitters
(Institute of Physics Publishing, 2012)
We discuss a new method for realizing number-resolving and non-demolition photo detectors by strong coupling of light to individual single photon emitters, which act as strong optical non-linearities. As a specific application ...
Dynamic Nuclear Polarization in Double Quantum Dots
(American Physical Society, 2010)
We theoretically investigate the controlled dynamic polarization of lattice nuclear spins in GaAs double quantum dots containing two electrons. Three regimes of long-term dynamics are identified, including the buildup of ...
Qubit Protection in Nuclear-Spin Quantum Dot Memories
(American Physical Society, 2009)
We present a mechanism to protect quantum information stored in an ensemble of nuclear spins in a semiconductor quantum dot. When the dot is charged the nuclei interact with the spin of the excess electron through the ...
Electromagnetically Induced Transparency with Noisy Lasers
(American Physical Society, 2009)
We demonstrate and characterize two coherent phenomena that can mitigate the effects of laser phase noise for Electromagnetically Induced Transparency (EIT): a laser-power-broadening-resistant resonance in the transmitted ...
Properties of Nitrogen-Vacancy Centers in Diamond: The Group Theoretic Approach
(Institute of Physics, 2011)
We present a procedure that makes use of group theory to analyze and predict the main properties of the negatively charged nitrogen-vacancy (NV) center in diamond. We focus on the relatively low temperature limit where ...
Relaxation of Fermionic Excitations in a Strongly Attractive Fermi Gas in an Optical Lattice
(American Physical Society, 2011)
We theoretically study the relaxation of high energy single particle excitations into molecules in a system of attractive fermions in an optical lattice, both in the superfluid and the normal phase. In a system characterized ...