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Search Results: 1 - 10 of 527495 matches for " M. D. Lukin "
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Dark-State Polaritons in Electromagnetically Induced Transparency
M. Fleischhauer,M. D. Lukin
Physics , 2000, DOI: 10.1103/PhysRevLett.84.5094
Abstract: We identify form-stable coupled excitations of light and matter (``dark-state polaritons'') associated with the propagation of quantum fields in Electromagnetically Induced Transparency. The properties of the dark-state polaritons such as the group velocity are determined by the mixing angle between light and matter components and can be controlled by an external coherent field as the pulse propagates. In particular, light pulses can be decelerated and ``trapped'' in which case their shape and quantum state are mapped onto metastable collective states of matter. Possible applications of this reversible coherent-control technique are discussed.
Quantum memory for photons: I. Dark state polaritons
M. Fleischhauer,M. D. Lukin
Physics , 2001, DOI: 10.1103/PhysRevA.65.022314
Abstract: An ideal and reversible transfer technique for the quantum state between light and metastable collective states of matter is presented and analyzed in detail. The method is based on the control of photon propagation in coherently driven 3-level atomic media, in which the group velocity is adiabatically reduced to zero. Form-stable coupled excitations of light and matter (``dark-state polaritons'') associated with the propagation of quantum fields in Electromagnetically Induced Transparency are identified, their basic properties discussed and their application for quantum memories for light analyzed.
Nonlinear Optics and Quantum Entanglement of Ultra-Slow Single Photons
M. D. Lukin,A. Imamoglu
Physics , 1999, DOI: 10.1103/PhysRevLett.84.1419
Abstract: Two light pulses propagating with ultra-slow group velocities in a coherently prepared atomic gas exhibit dissipation-free nonlinear coupling of an unprecedented strength. This enables a single-photon pulse to coherently control or manipulate the quantum state of the other. Processes of this kind result in generation of entangled states of radiation field and open up new prospectives for quantum information processing.
Atom correlations and spin squeezing near the Heisenberg limit: finite system size effect and decoherence
A. André,M. D. Lukin
Physics , 2001, DOI: 10.1103/PhysRevA.65.053819
Abstract: We analyze a model for spin squeezing based on the so-called counter-twisting Hamiltonian, including the effects of dissipation and finite system size. We discuss the conditions under which the Heisenberg limit, i.e. phase sensitivity $\propto 1/N$, can be achieved. A specific implementation of this model based on atom-atom interactions via quantized photon exchange is presented in detail. The resulting excitation corresponds to the creation of spin-flipped atomic pairs and can be used for fast generation of entangled atomic ensembles, spin squeezing and apllications in quantum information processing. The conditions for achieving strong spin squeezing with this mechanism are also analyzed.
Manipulating Light Pulses via Dynamically Controlled Photonic Bandgap
A. Andre,M. D. Lukin
Physics , 2002, DOI: 10.1103/PhysRevLett.89.143602
Abstract: When a resonance associated with electromagnetically induced transparency (EIT) in an atomic ensemble is modulated by an off-resonant standing light wave, a band of frequencies can appear for which light propagation is forbidden. We show that dynamic control of such a bandgap can be used to coherently convert a propagating light pulse into a stationary excitation with non-vanishing photonic component. This can be accomplished with high efficiency and negligble noise even at a level of few-photon quantum fields thereby facilitating possible applications in quantum nonlinear optics and quantum information.
Dephasing of quantum bits by a quasi-static mesoscopic environment
J. M. Taylor,M. D. Lukin
Physics , 2005,
Abstract: We examine coherent processes in a two-state quantum system that is strongly coupled to a mesoscopic spin bath and weakly coupled to other environmental degrees of freedom. Our analysis is specifically aimed at understanding the quantum dynamics of solid-state quantum bits such as electron spins in semiconductor structures and superconducting islands. The role of mesoscopic degrees of freedom with long correlation times (local degrees of freedom such as nuclear spins and charge traps) in qubit-related dephasing is discussed in terms of a quasi-static bath. A mathemat- ical framework simultaneously describing coupling to the slow mesoscopic bath and a Markovian environment is developed and the dephasing and decoherence properties of the total system are investigated. The model is applied to several specific examples with direct relevance to current ex- periments. Comparisons to experiments suggests that such quasi-static degrees of freedom play an important role in current qubit implementations. Several methods of mitigating the bath-induced error are considered.
Cavity quantum electrodynamics with semiconductor double-dot molecules on a chip
J. M. Taylor,M. D. Lukin
Physics , 2006,
Abstract: We describe a coherent control technique for coupling electron spin states associated with semiconductor double-dot molecule to a microwave stripline resonator on a chip. We identify a novel regime of operation in which strong interaction between a molecule and a resonator can be achieved with minimal decoherence, reaching the so-called strong coupling regime of cavity QED. We describe potential applications of such a system, including low-noise coherent electrical control, fast QND measurements of spin states, and long-range spin coupling.
Dynamical Crystallization in the Dipole Blockade of Ultracold Atoms
T. Pohl,E. Demler,M. D. Lukin
Physics , 2009, DOI: 10.1103/PhysRevLett.104.043002
Abstract: We describe a method for controlling many-body states in extended ensembles of Rydberg atoms, forming crystalline structures during laser excitation of a frozen atomic gas. Specifically, we predict the existence of an excitation number staircase in laser excitation of atomic ensembles into Rydberg states. Each step corresponds to a crystalline state with a well-defined of regularly spaced Rydberg atoms. We show that such states can be selectively excited by chirped laser pulses. Finally, we demonstarte that, sing quantum state transfer from atoms to light, such crystals can be used to create crystalline photonic states and can be probed via photon correlation measurements.
Mesoscopic molecular ions in Bose-Einstein condensates
Robin Cote,V. Kharchenko,M. D. Lukin
Physics , 2001, DOI: 10.1103/PhysRevLett.89.093001
Abstract: We study the possible formation of large (mesoscopic) molecular ions in an ultracold degenerate bosonic gas doped with charged particles (ions). We show that the polarization potentials produced by the ionic impurities are capable of capturing hundreds of atoms into loosely bound states. We describe the spontaneous formation of these hollow molecular ions via phonon emission and suggest an optical technique for coherent stimulated transitions of free atoms into a specific bound state. These results open up new interesting possibilities for manipulating tightly confined ensembles.
Coherent Control of Atom-Atom Interactions and Entanglement using Optical Fields
M. D. Lukin,P. R. Hemmer
Physics , 1999,
Abstract: Two-photon optical transitions combined with long-range dipole-dipole interactions can be used for the coherent manipulation of collective metastable states composed of different atoms. We show that it is possible to induce optical resonances accompanied by the generation of entangled superpositions of the atomic states. Resonances of this kind can be used to implement quantum logic gates using optically excited single atoms (impurities) in the condensed phase.
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