Gershon Kurizki | Weizmann Institute of Science (original) (raw)

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Papers by Gershon Kurizki

Research paper thumbnail of Adiabatic and Nonadiabatic Protection from Decoherence

Springer eBooks, Dec 13, 2005

Research paper thumbnail of Optimized control of quantum state transfer from noisy to quiet qubits

Journal of Physics B, Jul 25, 2011

We analyze quantum state-transfer optimization within hybrid open systems, from a "noisy" (write-... more We analyze quantum state-transfer optimization within hybrid open systems, from a "noisy" (write-in) qubit to its "quiet" counterpart (storage qubit). Intriguing interplay is revealed between our ability to avoid bath-induced errors that profoundly depend on the bath-memory time and the limitations imposed by leakage out of the operational subspace. Counterintuitively, under no circumstances is the fastest transfer optimal (for a given transfer energy).

Research paper thumbnail of Bath-Optimized Minimal-Energy Protection of Quantum Operations from Decoherence

Physical Review Letters, Jan 25, 2010

We derive and investigate a general non-Markovian equation for the time-dependence of a Hamiltoni... more We derive and investigate a general non-Markovian equation for the time-dependence of a Hamiltonian that maximizes the fidelity of a desired quantum gate on any finite-dimensional quantum system in the presence of arbitrary bath and noise sources. The method is illustrated for a singlequbit gate implemented on a three-level system.

Research paper thumbnail of Photon-statistics control by field-atom interactions in photonic band structures

OSA Annual Meeting, 1993

The density and spatial modulation of field modes should become better controllable in structures... more The density and spatial modulation of field modes should become better controllable in structures that exhibit photonic band gaps (PBGs)1.

Research paper thumbnail of Nonadiabatic relaxation control of qubits strongly coupled to continuum edge

Physical Review A, Mar 18, 2005

We propose a method for contolling the decoherence of a driven qubit that is strongly coupled to ... more We propose a method for contolling the decoherence of a driven qubit that is strongly coupled to a reservoir, when the qubit resonance frequency is close to a continuum edge of the reservoir spectrum. This strong-coupling regime is outside the scope of existing methods of decoherence control. We demonstrate that an appropriate sequence of nearly abrupt changes of the resonance frequency can protect the qubit state from decay and decoherence more effectively than the intuitively obvious alternative, which is to fix the resonance well within a forbidden bandgap of the reservoir spectrum, as far as possible from the continuum edge. The "counterintuitive" nonadiabatic method outlined here can outperform its adiabatic counterparts in maintaining a high fidelity of quantum logic operations. The remarkable effectiveness of the proposed method, which requires much lower rates of frequency changes than previously proposed control methods, is due to the ability of appropriately alternating detunings from the continuum edge to augment the interference of the emitted and back-scattered quanta, thereby helping to stabilize the qubit state against decay. Applications to the control of decoherence near the edge of radiative, vibrational and photoionization continua are discussed.

Research paper thumbnail of Using Conditional Measurements to Combat Decoherence

Journal of Superconductivity, 1999

With the help of some remarkable examples, it is shown that conditional measurements performed on... more With the help of some remarkable examples, it is shown that conditional measurements performed on two-level atoms just after they have interacted with a resonant cavity field mode are able to recover the coherence of number-state superpositions, which is lost due to dissipation.

Research paper thumbnail of Editorial Article

NATO Science Series II: Mathematics, Physics and Chemistry

Research paper thumbnail of Non-Holonomic Control I

Proceedings of SPIE - The International Society for Optical Engineering

In this paper, we present a universal control technique, the non-holonomic control, which allows ... more In this paper, we present a universal control technique, the non-holonomic control, which allows us to impose any arbitrarily prescribed unitary evolution to any quantum system through the alternate application of two well-chosen perturbations.

Research paper thumbnail of Recovering coherence via conditional measurements

Optics Communications, 1998

We show that conditional measurements on atoms following their interaction with a resonant cavity... more We show that conditional measurements on atoms following their interaction with a resonant cavity field mode can be used to effectively counter the decoherence of Fock-state superpositions due to cavity leakage.

Research paper thumbnail of Decoherence, Entanglement and Information Protection in Complex Quantum Systems

NATO science series, 2005

Research paper thumbnail of Non-Marlcovian control of qubit thermodynamics by frequent quantum measurements

Physica E Low Dimentional Systems and Nanostructures, 2010

Research paper thumbnail of Electromagnetically-Induced Isothermal

Research paper thumbnail of Non-Markovian Decay and Decoherence in Open Quantum Systems

NATO Science Series II: Mathematics, Physics and Chemistry, 2005

ABSTRACT

Research paper thumbnail of The threshold conditions for FEL WI (single particle approximation)

Research paper thumbnail of Non-holonomic control I

Research paper thumbnail of <title>Nonlinear optical processes in droplets with single-mode laser excitation</title>

Nonlinear Optics and Materials, 1991

ABSTRACT

Research paper thumbnail of <title>Amorphous silicon technology improvement at CEA-LETI</title>

Photodetector Materials and Devices VII, 2002

Recent developments in the research in quantum cascade laser technology in university of Neuchate... more Recent developments in the research in quantum cascade laser technology in university of Neuchatel are reviewed. We report operation of quantum cascade lasers at high temperature (up to 10mW peak power at 90C) and of distributed feedback quantum cascade lasers with single-mode surface emission. New results in the investigation ofmid-IR emission from InGaN/GaN LED's are also discussed.

Research paper thumbnail of Coherence and Quantum Optics VI

Research paper thumbnail of Frontiers of Quantum Decoherence: An International Workshop

... Christopher Bäuerle Decoherence in metallic quantum wires and quantum networks Aashish Clerk ... more ... Christopher Bäuerle Decoherence in metallic quantum wires and quantum networks Aashish Clerk Quantum-Limited Detection With Strongly ... 1/f Noise in Josephson Junctions Daniel Lidar Adiabaticity in open quantum systems Raj Mohanty QUANTUM NANOMECHANICS ...

Research paper thumbnail of Translational Entanglement and Teleportation of Matter Wavepackets by Collisions and Half-Collisions

International Journal of Modern Physics B

To date, the translationally-entangled state originally proposed by Einstein, Podolsky and Rosen ... more To date, the translationally-entangled state originally proposed by Einstein, Podolsky and Rosen (EPR) in 1935 has not been experimentally realized for massive particles. Opatrný and Kurizki [Phys. Rev. Lett.86, 3180 (2000)] have suggested the creation of a position- and momentum-correlated, i.e., translationally-entangled, pair of particles approximating the EPR state by dissociation of cold diatomic molecules, and further manipulation of the EPR pair effecting matter-wave teleportation. Here we aim at setting the principles of and quantifying translational entanglement by collisions and half-collisions. In collisions, the resonance width s and the initial phase-space distributions are shown to determine the degree of post-collisional momentum entanglement. Half-collisions (dissociation) are shown to yield different types of approximate EPR states. We analyse a feasible realization of translational EPR entanglement and teleportation via cold-molecule Raman dissociation and subseque...

Research paper thumbnail of Adiabatic and Nonadiabatic Protection from Decoherence

Springer eBooks, Dec 13, 2005

Research paper thumbnail of Optimized control of quantum state transfer from noisy to quiet qubits

Journal of Physics B, Jul 25, 2011

We analyze quantum state-transfer optimization within hybrid open systems, from a "noisy" (write-... more We analyze quantum state-transfer optimization within hybrid open systems, from a "noisy" (write-in) qubit to its "quiet" counterpart (storage qubit). Intriguing interplay is revealed between our ability to avoid bath-induced errors that profoundly depend on the bath-memory time and the limitations imposed by leakage out of the operational subspace. Counterintuitively, under no circumstances is the fastest transfer optimal (for a given transfer energy).

Research paper thumbnail of Bath-Optimized Minimal-Energy Protection of Quantum Operations from Decoherence

Physical Review Letters, Jan 25, 2010

We derive and investigate a general non-Markovian equation for the time-dependence of a Hamiltoni... more We derive and investigate a general non-Markovian equation for the time-dependence of a Hamiltonian that maximizes the fidelity of a desired quantum gate on any finite-dimensional quantum system in the presence of arbitrary bath and noise sources. The method is illustrated for a singlequbit gate implemented on a three-level system.

Research paper thumbnail of Photon-statistics control by field-atom interactions in photonic band structures

OSA Annual Meeting, 1993

The density and spatial modulation of field modes should become better controllable in structures... more The density and spatial modulation of field modes should become better controllable in structures that exhibit photonic band gaps (PBGs)1.

Research paper thumbnail of Nonadiabatic relaxation control of qubits strongly coupled to continuum edge

Physical Review A, Mar 18, 2005

We propose a method for contolling the decoherence of a driven qubit that is strongly coupled to ... more We propose a method for contolling the decoherence of a driven qubit that is strongly coupled to a reservoir, when the qubit resonance frequency is close to a continuum edge of the reservoir spectrum. This strong-coupling regime is outside the scope of existing methods of decoherence control. We demonstrate that an appropriate sequence of nearly abrupt changes of the resonance frequency can protect the qubit state from decay and decoherence more effectively than the intuitively obvious alternative, which is to fix the resonance well within a forbidden bandgap of the reservoir spectrum, as far as possible from the continuum edge. The "counterintuitive" nonadiabatic method outlined here can outperform its adiabatic counterparts in maintaining a high fidelity of quantum logic operations. The remarkable effectiveness of the proposed method, which requires much lower rates of frequency changes than previously proposed control methods, is due to the ability of appropriately alternating detunings from the continuum edge to augment the interference of the emitted and back-scattered quanta, thereby helping to stabilize the qubit state against decay. Applications to the control of decoherence near the edge of radiative, vibrational and photoionization continua are discussed.

Research paper thumbnail of Using Conditional Measurements to Combat Decoherence

Journal of Superconductivity, 1999

With the help of some remarkable examples, it is shown that conditional measurements performed on... more With the help of some remarkable examples, it is shown that conditional measurements performed on two-level atoms just after they have interacted with a resonant cavity field mode are able to recover the coherence of number-state superpositions, which is lost due to dissipation.

Research paper thumbnail of Editorial Article

NATO Science Series II: Mathematics, Physics and Chemistry

Research paper thumbnail of Non-Holonomic Control I

Proceedings of SPIE - The International Society for Optical Engineering

In this paper, we present a universal control technique, the non-holonomic control, which allows ... more In this paper, we present a universal control technique, the non-holonomic control, which allows us to impose any arbitrarily prescribed unitary evolution to any quantum system through the alternate application of two well-chosen perturbations.

Research paper thumbnail of Recovering coherence via conditional measurements

Optics Communications, 1998

We show that conditional measurements on atoms following their interaction with a resonant cavity... more We show that conditional measurements on atoms following their interaction with a resonant cavity field mode can be used to effectively counter the decoherence of Fock-state superpositions due to cavity leakage.

Research paper thumbnail of Decoherence, Entanglement and Information Protection in Complex Quantum Systems

NATO science series, 2005

Research paper thumbnail of Non-Marlcovian control of qubit thermodynamics by frequent quantum measurements

Physica E Low Dimentional Systems and Nanostructures, 2010

Research paper thumbnail of Electromagnetically-Induced Isothermal

Research paper thumbnail of Non-Markovian Decay and Decoherence in Open Quantum Systems

NATO Science Series II: Mathematics, Physics and Chemistry, 2005

ABSTRACT

Research paper thumbnail of The threshold conditions for FEL WI (single particle approximation)

Research paper thumbnail of Non-holonomic control I

Research paper thumbnail of <title>Nonlinear optical processes in droplets with single-mode laser excitation</title>

Nonlinear Optics and Materials, 1991

ABSTRACT

Research paper thumbnail of <title>Amorphous silicon technology improvement at CEA-LETI</title>

Photodetector Materials and Devices VII, 2002

Recent developments in the research in quantum cascade laser technology in university of Neuchate... more Recent developments in the research in quantum cascade laser technology in university of Neuchatel are reviewed. We report operation of quantum cascade lasers at high temperature (up to 10mW peak power at 90C) and of distributed feedback quantum cascade lasers with single-mode surface emission. New results in the investigation ofmid-IR emission from InGaN/GaN LED's are also discussed.

Research paper thumbnail of Coherence and Quantum Optics VI

Research paper thumbnail of Frontiers of Quantum Decoherence: An International Workshop

... Christopher Bäuerle Decoherence in metallic quantum wires and quantum networks Aashish Clerk ... more ... Christopher Bäuerle Decoherence in metallic quantum wires and quantum networks Aashish Clerk Quantum-Limited Detection With Strongly ... 1/f Noise in Josephson Junctions Daniel Lidar Adiabaticity in open quantum systems Raj Mohanty QUANTUM NANOMECHANICS ...

Research paper thumbnail of Translational Entanglement and Teleportation of Matter Wavepackets by Collisions and Half-Collisions

International Journal of Modern Physics B

To date, the translationally-entangled state originally proposed by Einstein, Podolsky and Rosen ... more To date, the translationally-entangled state originally proposed by Einstein, Podolsky and Rosen (EPR) in 1935 has not been experimentally realized for massive particles. Opatrný and Kurizki [Phys. Rev. Lett.86, 3180 (2000)] have suggested the creation of a position- and momentum-correlated, i.e., translationally-entangled, pair of particles approximating the EPR state by dissociation of cold diatomic molecules, and further manipulation of the EPR pair effecting matter-wave teleportation. Here we aim at setting the principles of and quantifying translational entanglement by collisions and half-collisions. In collisions, the resonance width s and the initial phase-space distributions are shown to determine the degree of post-collisional momentum entanglement. Half-collisions (dissociation) are shown to yield different types of approximate EPR states. We analyse a feasible realization of translational EPR entanglement and teleportation via cold-molecule Raman dissociation and subseque...