Path-phase duality of an interfering particle with translational-internal entanglement (2007)
Kolar, M., Opatrny, T., Bar-Gill, N., Erez, N., Kurizki, G.
The aim of this paper is to revisit the implications of complementarity when we inject into a Mach Zehnder interferometer particles with internal structure, prepared in special translational-internal...
Kolar, M., Opatrny, T., Kurizki, G.
A polarized photon with well-defined orbital angular momentum that emerges from a Mach-Zehnder interferometer (MZI) is shown to circumvent wave-particle duality. Its polarization-resolved detection...
Single-passage read-out of atomic quantum memory (2005)
Fiurasek, J., Sherson, J., Opatrny, T., Polzik, E. S.
A scheme for retrieving quantum information stored in collective atomic spin systems onto optical pulses is presented. Two off-resonant light pulses cross the atomic medium in two orthogonal...
Enhancing the capacity and performance of collective atomic quantum memory (2005)
Present schemes involving the quantum non-demolition interaction between atomic samples and off-resonant light pulses allow us to store quantum information corresponding to a single harmonic...
Opatrny, T., Kolar, M., Kurizki, G., Deb, B.
We study a possible realization of the position- and momentum-correlated atomic pairs that are confined to adjacent sites of two mutually shifted optical lattices and are entangled via laser-induced...
Translational Entanglement of Dipole-Dipole Interacting Atoms in Optical Lattices (2003)
Opatrny, T., Deb, B., Kurizki, G.
We propose and investigate a realization of the position- and momentum-correlated Einstein-Podolsky-Rosen (EPR) states [Phys. Rev. 47, 777 (1935)] that have hitherto eluded detection. The realization...
Mode structure and photon number correlations in squeezed quantum pulses (2002)
Opatrny, T., Korolkova, N., Leuchs, G.
The question of efficient multimode description of optical pulses is studied. We show that a relatively very small number of nonmonochromatic modes can be sufficient for a complete quantum...
Scully, M. O., Kattawar, G. W., Lucht, R. P., Opatrny, T., Pilloff, H., Rebane, A., ...
Airborne contaminants, e.g., bacterial spores, are usually analyzed by time consuming microscopic, chemical and biological assays. Current research into real time laser spectroscopic detectors of...
We propose an optical double-cavity resonator whose response to a signal is similar to that of an Electromagnetically Induced Transparency (EIT) medium. A combination of such a device with a...
Zeno and anti-Zeno effects for photon polarization dephasing (2000)
Kofman, A. G., Kurizki, G., Opatrny, T.
We discuss a simple, experimentally feasible scheme, which elucidates the principles of controlling ("engineering") the reservoir spectrum and the spectral broadening incurred by repeated...
Entanglement transformation at dielectric four-port devices (2000)
Scheel, S., Knoll, L., Opatrny, T.
Quantum communication schemes widely use dielectric four-port devices as basic elements for constructing optical quantum channels. Since for causality reasons the permittivity is necessarily a...
Matter-wave entanglement and teleportation by molecular dissociation and collisions (2000)
We propose dissociation of cold diatomic molecules as a source of atom pairs with highly correlated (entangled) positions and momenta, approximating the original quantum state introduced by Einstein,...
Optical Solitons in Periodic Media with Resonant and Off-Resonant Nonlinearities (2000)
Kurizki, G., Kozhekin, A. E., Opatrny, T., Malomed, B.
The properties of optical solitons in periodic nonlinear media are reviewed. The emphasis is on solitons in periodically refractive media (Bragg gratings) incorporating a periodic set of thin layers...
Sampling the canonical phase from phase-space functions (2000)
Fiurasek, J., Dakna, M., Opatrny, T.
We discuss the possibility of sampling exponential moments of the canonical phase from the s-parametrized phase space functions. We show that the sampling kernels exist and are well-behaved for any...
Conditional teleportation using optical squeezers and photon counting (2000)
We suggest a scheme of using two-mode squeezed vacuum for conditional teleportation of quantum states of optical field. Alice mixes the input state with one of the squeezed modes on another squeezing...
On the possibility of quantum computation based on photon exchange interactions (2000)
We examine several proposed schemes by Franson et al. for quantum logic gates based on non-local exchange interactions between two photons in a medium. In these schemes the presence of a {\em single}...
We show that the recently proposed scheme of teleportation of continuous variables [S.L. Braunstein and H.J. Kimble, Phys. Rev. Lett. 80, 869 (1998)] can be improved by a conditional measurement in...
Optimization approach to entanglement distillation (1998)
We put forward a method for optimized distillation of partly entangled pairs of qubits into a smaller number of more entangled pairs by recurrent local unitary operations and projections. Optimized...
Homodyne measurement of exponential phase moments for quantum-phase reconstruction (1998)
Dakna, M., Breitenbach, G., Mlynek, J., Opatrny, T., Schiller, S.
We directly sample the exponential moments of the canonical phase for various quantum states from the homodyne output. The method enables us to study the phase properties experimentally, without...
Homodyne measurement of exponential phase moments (1997)
Dakna, M., Opatrny, T., Welsch, D. G.
It is shown that the exponential moments of the canonical phase can be directly sampled from the data recorded in balanced homodyne detection. Analytical expressions for the sampling functions are...
Exponential Moments of Canonical Phase: Homodyne Measurements (1997)
A method for direct sampling of the exponential moments of canonical phase from the data recorded in balanced homodyne detection is presented. Analytical expressions for the sampling functions are...
Dakna, M., Knoll, L., Opatrny, T.
The problem of photon adding and subtracting is studied, using conditional output measurement on a beam splitter. It is shown that for various classes of states the corresponding photon-added and...
Number phase uncertainty relations: verification by homodyning (1997)
It is shown that fundamental uncertainty relations between photon number and canonical phase of a single-mode optical field can be verified by means of balanced homodyne measurement. All the relevant...
Least-squares inversion for density-matrix reconstruction (1997)
We propose a method for reconstruction of the density matrix from measurable time-dependent (probability) distributions of physical quantities. The applicability of the method based on least-squares...
Multi-mode density matrices of light via amplitude and phase control (1996)
A new method is described for determining the quantum state of correlated multimode radiation by interfering the modes and measuring the statistics of the superimposed fields in four-port balanced...
Homodyne detection for measuring internal quantum correlations of optical pulses (1996)
A new method is described for determining the quantum correlations at different times in optical pulses by using balanced homodyne detection. The signal pulse and sequences of ultrashort test pulses...