Search
Now showing items 31-38 of 38
Implementing Deutsch-Jozsa algorithm using light shifts and atomic ensembles
(American Physical Society, 2005-01-27)
We present an optical scheme to implement the Deutsch-Jozsa algorithm using ac Stark shifts. The scheme uses an atomic ensemble consisting of four-level atoms interacting dispersively with a field. This leads to a Hamiltonian ...
Solitonic behaviour in coupled multi atom-cavity systems
(IOP Publishing, 2009-01-30)
In view of current research effort on semiconducting photonic-crystal defect microcavities, we consider the dynamics of an array of coupled optical cavities, each containing an ensemble of qubits. By concentrating on the ...
Entanglement by linear SU(2) transformations: Generation and evolution of quantum vortex states
(IOP Publishing, 2006-07-31)
We consider the evolution of a two-mode system of bosons under the action of a Hamiltonian that generates linear SU(2) transformations. The Hamiltonian is generic in that it represents a host of entanglement mechanisms, ...
Entangling pairs of nano-cantilevers, Cooper-pair boxes and mesoscopic teleportation
(IOP Publishing, 2006-03-07)
We propose two schemes to establish entanglement between two mesoscopic quantum systems through a third mesoscopic quantum system. The first scheme entangles two nano-mechanical oscillators in a non-Gaussian entangled state ...
Interferences in parametric interactions driven by quantized fields
(American Physical Society, 2006-07-11)
We report interferences in the quantum fluctuations of the output of a parametric amplifier when the cavity is driven by a quantized field at the signal frequency. The interferences depend on the phase fluctuations of the ...
Vacuum-induced Stark shifts for quantum logic using a collective system in a high-quality dispersive cavity
(American Physical Society, 2005-05-13)
A collective system of atoms in a high-quality cavity can be described by a nonlinear interaction which arises due to the Lamb shift of the energy levels due to the cavity vacuum [Agarwal et al., Phys. Rev. A 56, 2249 ...
Nonclassicality and decoherence of photon-subtracted squeezed states
(American Physical Society, 2007-03-07)
We discuss nonclassical properties of single-photon subtracted squeezed vacuum states in terms of the sub-Poissonian statistics and the negativity of the Wigner function. We derive a compact expression for the Wigner ...
Quantum random walk of the field in an externally driven cavity
(American Physical Society, 2005-09-16)
Using a resonant interaction between atoms and the field in a high-quality cavity, we show how to realize quantum random walks as proposed by Aharonov et al. [Phys. Rev. A 48, 1687 (1993)]. The atoms are driven strongly ...