A5077978476- Cold Atom Physics and Bose-Einstein Condensates
- Quantum optics and atomic interactions
- Quantum Information and Cryptography
- Strong Light-Matter Interactions
- Quantum, superfluid, helium dynamics
- Atomic and Subatomic Physics Research
- Quantum Computing Algorithms and Architecture
- Advanced Neural Network Applications
- Neural Networks and Reservoir Computing
- Quantum Electrodynamics and Casimir Effect
- Mechanical and Optical Resonators
- Machine Learning and Data Classification
- Quantum Mechanics and Applications
- Force Microscopy Techniques and Applications
- Anomaly Detection Techniques and Applications
- Photonic and Optical Devices
- Advanced Thermodynamics and Statistical Mechanics
- Complex Network Analysis Techniques
- Molecular Junctions and Nanostructures
- Opinion Dynamics and Social Influence
- Advanced Image and Video Retrieval Techniques
- Time Series Analysis and Forecasting
- Domain Adaptation and Few-Shot Learning
- Industrial Vision Systems and Defect Detection
- Solid-state spectroscopy and crystallography
Momentum (United Kingdom)
2023
Rigetti Computing (United States)
2017-2018
Harvard University
2012-2017
Harvard University Press
2011-2014
University of Kaiserslautern
2008-2011
Forschungszentrum Jülich
1971
We develop the theory of light propagation under conditions electromagnetically induced transparency in systems involving strongly interacting Rydberg states. Taking into account quantum nature and spatial light, we analyze interactions few-photon pulses. show that this system can be used for generation nonclassical states including trains single photons with an avoided volume between them, implementing photon-photon gates, as well studying many-body phenomena correlated photons.
We propose and analyze a novel mechanism for long-range spin-spin interactions in diamond nanostructures. The between electronic spins, associated with nitrogen-vacancy centers diamond, are mediated by their coupling via strain to the vibrational mode of mechanical nanoresonator. This results phonon-mediated effective that can be used generate squeezed states spin ensemble. show dephasing relaxation largely suppressed, allowing substantial squeezing under realistic experimental conditions....
Harnessing techniques from analog signal processing, we establish a new path for large-scale quantum computation.
Machine learning techniques have led to broad adoption of a statistical model computing. The distributions natively available on quantum processors are superset those classically. Harnessing this attribute has the potential accelerate or otherwise improve machine relative purely classical performance. A key challenge toward that goal is hybridize computing resources and traditional with emerging capabilities general purpose processors. Here, we demonstrate such hybridization by training...
We present a theory of electromagnetically induced transparency in cold ensemble strongly interacting Rydberg atoms. Long-range interactions between the atoms constrain medium to behave as collection superatoms, each comprising blockade volume that can accommodate at most one excitation. The propagation probe field is affected by its two-photon correlations within distance, which are damped due low saturation threshold superatoms. Our model computationally very efficient and quantitative...
We present and analyze a new approach for the generation of atomic spin-squeezed states. Our method involves collective coupling an ensemble to decaying mode open optical cavity. demonstrate existence dark state, decoupled from radiation field. By explicitly constructing this state we find that it can feature spin squeezing bounded only by Heisenberg limit. show such states be deterministically prepared via dissipative means, thus turning dissipation into resource entanglement. The scaling...
A central challenge in building a scalable quantum computer with superconducting qubits is the execution of high-fidelity two-qubit gates presence many resonant elements. As more elements are added to architecture, and as multiplicity their couplings grows, design's frequency space becomes crowded, performance suffers. The authors present way address this difficulty: selective activation interactions between transmon fixed those tunable frequency. This depends on both amplitude modulation,...
The coupling of weak light fields to Rydberg states atoms under conditions electromagnetically induced transparency leads the formation polaritons which are quasiparticles with tunable effective mass and nonlocal interactions. Confined one spatial dimension their low energy physics is that a moving-frame Luttinger liquid which, due character repulsive interaction, can form Wigner crystal individual photons. We calculate $K$ parameter using density-matrix renormalization group simulations...
Understanding the universal properties of non-equilibrium phase transitions spreading processes is a challenging problem. This applies in particular to irregular and dynamically varying networks. We here investigate an experimentally accessible model system for such processes, namely absorbing-state transition (ASPT) Rydberg-excitation spreading, known as Rydberg facilitation, laser-driven gas mobile atoms. It occurs on graph, set by random atom positions and, depending temperature, changes...
We present a general scheme to determine the loss-free adiabatic eigensolutions (dark-state polaritons) of interaction multiple probe laser beams with coherently driven atomic ensemble under conditions electromagnetically induced transparency. To this end we generalize Morris-Shore transformation linearized Heisenberg-Langevin equations describing coupled light-matter system in weak excitation limit. For simple lambda-type coupling generalized reproduces dark-state polariton solutions slow...
We propose and analyze a mechanism for Bose-Einstein condensation of stationary dark-state polaritons. Dark-state polaritons (DSPs) are formed in the interaction light with laser-driven 3-level $\ensuremath{\Lambda}$-type atoms basis phenomena such as electromagnetically induced transparency, ultraslow, stored light. They have long intrinsic lifetimes setup, 3D quadratic dispersion profile variable effective mass. Since DSPs bosons, they can undergo at critical temperature which be many...
We discuss the properties of 1D stationary pulses light in an atomic ensemble with electromagnetically induced transparency limit tight spatial confinement. When size wave packet becomes comparable or smaller than absorption length medium, it must be described by a two-component vector which obeys one-dimensional Dirac equation effective mass m;{*} and speed c;{*}. Then fundamental lower to width external potential arises from Klein tunneling is given Compton lambda_{C}=variant Planck's over...
We describe a method to create effective gauge potentials for stationary-light polaritons. When stationary light is created in the interaction with rotating ensemble of coherently driven double-$\ensuremath{\Lambda}$ type atoms, equation motion that massive Schr\"odinger particle magnetic field. Since area polaritons can be made large, degenerate Landau levels degeneracy well above 100. This opens up possibility study bosonic analogue fractional quantum Hall effect interacting
Noisy intermediate-scale quantum computing devices are an exciting platform for the exploration of power near-term applications. Performing nontrivial tasks in such requires a fundamentally different approach than what would be used on error-corrected computer. One is to use hybrid algorithms, where problems reduced parameterized circuit that often optimized classical feedback loop. Here we describe one algorithm machine learning by building upon known as random kitchen sinks. Our technique,...
We consider the interaction of two weak probe fields light with an atomic ensemble coherently driven by pairs standing wave laser in a tripod-type linkage scheme. The system is shown to exhibit Dirac-like spectrum for light-matter quasiparticles multiple dark states, termed spinor slow-light polaritons. They posses "effective speed light" given group velocity slow light, and can be made massive inducing small two-photon detuning. Control detuning used locally vary mass including sign flip....
We propose a new protocol for implementing the two-qubit photonic phase gate. In our approach, π is acquired by mapping two single photons into atomic excitations with fermionic character and exchanging their positions. The are realized as spin waves in chain, while photon storage techniques provide interface between waves. Possible imperfections experimental systems suitable gate discussed.
We propose a technique for engineering momentum-dependent dissipation in Bose-Einstein condensates with nonlocal interactions. The scheme relies on the use of dark states close analogy to velocity-selective coherent population trapping. During short-time dissipative dynamics, system is driven into particular finite-momentum phonon mode, which real space corresponds an ordered structure density-density correlations. Dissipation-induced ordering can be observed and studied present-day...
Small satellites enable many important applications for both economic and scientific purposes. Many of these are inherently data-centric rely on large amounts high-resolution satellite imagery to be delivered in a timely manner. However, communicating this data Earth is challenging due intermittent connectivity, high packet losses, low rates, similar issues. Therefore, efficient onboard prioritization processing essential future missions. Machine learning methods, such as deep neural...
We study the dynamics of a spin–orbit (SO)-coupled Schrödinger particle with two internal degrees freedom moving in one-dimensional random potential. Numerical calculation density states reveals emergence Dyson-like singularity at zero energy when system approaches quasi-relativistic limit random-mass Dirac model for large SO coupling. Simulations expansion an initially localized wave-packet show crossover from exponential (Anderson) localization to anomalous power-law behavior reminiscent...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetic analysis and mechanism of chlorine-38 bromine-82 recoil reactions in K2[ReBr6]/K2[ReCl6] mixed crystalsK. Roessler, J. Otterbach, G. StoecklinCite this: Phys. Chem. 1972, 76, 18, 2499–2506Publication Date (Print):August 1, 1972Publication History Published online1 May 2002Published inissue 1 August 1972https://doi.org/10.1021/j100662a003RIGHTS & PERMISSIONSArticle Views17Altmetric-Citations25LEARN ABOUT THESE METRICSArticle Views are the...
We consider two-component "spinor" slow light in an ensemble of atoms coherently driven by two pairs counterpropagating control laser fields a double tripod-type linkage scheme. derive equation motion for the spinor (SSL) representing effective Dirac massive particle with mass determined two-photon detuning. By changing detuning atomic medium acts as photonic crystal controllable band gap. If frequency incident probe lies within gap, tunnels through sample. For frequencies outside...
We investigate a hybrid electromechanical system consisting of pair charged macroscopic mechanical oscillators coupled to small ensemble Rydberg atoms. The resonant dipole-dipole coupling between an internal atomic transition and the mechanics allows cooling its motional ground state with single atom despite considerable mass imbalance two subsystems. show that rich electronic spectrum atoms, combined their high degree optical control, paves way towards implementing various quantum-control...
Self-supervised pre-training strategies have recently shown impressive results for training general-purpose feature extraction backbones in computer vision. In combination with the Vision Transformer architecture, DINO self-distillation technique has interesting emerging proper-ties, such as unsupervised clustering latent space and semantic correspondences of produced features without using explicit human-annotated labels. The STEGO method segmentation contrastively distills a...
We present a general proof that Dirac particles cannot be localized below their Compton length by symmetric but otherwise arbitrary scalar potentials. This does not invoke the Heisenberg uncertainty relation and thus rely on nonrelativistic linear momentum relation. Further it is argued result also applicable for more potentials, as, e.g., generated nonlinear interactions. Finally possible realization of such system proposed.