Robert J. Lewis-Swan
University of Oklahoma
Quantum entanglementPhysicsStatistical physicsBell's theoremIonPhase transitionQuantum dynamicsPhotonQuantum simulatorInterferometryQuantum limitAtomic physicsField (physics)Optical cavityQuantum electrodynamicsQuantum mechanicsSpin-½QuantumQuantum sensor
65Publications
17H-index
827Citations
Publications 62
Newest
#1Michael A. PerlinH-Index: 6
#2Diego BarberenaH-Index: 6
Last. Ana Maria ReyH-Index: 62
view all 6 authors...
We study multilevel fermions in an optical lattice described by the Hubbard model with on site SU(n-symmetric interactions. We show that in an appropriate parameter regime this system can be mapped onto a spin model with all-to-all SU(n-symmetric couplings. Raman pulses that address internal spin states modify the atomic dispersion relation and induce spin-orbit coupling, which can act as a synthetic inhomogeneous magnetic field that competes with the SU(n exchange interactions. We inve...
#1Q. Guan (OU: University of Oklahoma)H-Index: 6
#2Grant Biedermann (OU: University of Oklahoma)H-Index: 15
Last. Robert J. Lewis-Swan (OU: University of Oklahoma)H-Index: 17
view all 4 authors...
We theoretically investigate how entangled atomic states generated via spin-changing collisions in a spinor Bose-Einstein condensate can be designed and controllably prepared for atom interferometry that is robust against common technical issues, such as limited detector resolution. We use analytic and numerical treatments of the spin-changing collision process to demonstrate that triggering the entangling collisions with a small classical seed rather than vacuum fluctuations leads to a more rob...
#1Kevin A. GilmoreH-Index: 8
#2M. Affolter (NIST: National Institute of Standards and Technology)H-Index: 6
Last. John J. Bollinger (NIST: National Institute of Standards and Technology)H-Index: 56
view all 7 authors...
Fully controllable ultracold atomic systems are creating opportunities for quantum sensing, yet demonstrating a quantum advantage in useful applications by harnessing entanglement remains a challenging task. Here, we realize a many-body quantum-enhanced sensor to detect displacements and electric fields using a crystal of ~150 trapped ions. The center-of-mass vibrational mode of the crystal serves as a high-Q mechanical oscillator, and the collective electronic spin serves as the measurement dev...
Source
We theoretically study the dynamical phase diagram of the Dicke model in both classical and quantum limits using large, experimentally relevant system sizes. Our analysis elucidates that the model features dynamical critical points that are distinct from previously investigated excited-state equilibrium transitions. Moreover, our numerical calculations demonstrate that mean-field features of the dynamics remain valid in the exact quantum dynamics, but we also find that in regimes where quantum e...
Source
#2Diego Barberena (CU: University of Colorado Boulder)H-Index: 6
Last. Ana Maria Rey (CU: University of Colorado Boulder)H-Index: 62
view all 6 authors...
We propose to simulate dynamical phases of a BCS superconductor using an ensemble of cold atoms trapped in an optical cavity. Effective Cooper pairs are encoded via internal states of the atoms and attractive interactions are realized via the exchange of virtual photons between atoms coupled to a common cavity mode. Control of the interaction strength combined with a tunable dispersion relation of the effective Cooper pairs allows exploration of the full dynamical phase diagram of the BCS model,...
Source
We propose the quantum Fisher information (QFI) as a tool to characterize dynamical phase transitions in closed quantum systems, which are usually defined in terms of non-analytic behaviour of a time-averaged order parameter. Employing the Lipkin-Meshkov-Glick model as an illustrative example, we predict that DPTs correlate with a divergent peak in the QFI that indicates the presence of correlations and entanglement useful for quantum metrology. We discuss a simple analytic model that connects t...
Source
#1Kevin A. GilmoreH-Index: 8
#2M. AffolterH-Index: 6
Last. John J. BollingerH-Index: 56
view all 7 authors...
Developing the isolation and control of ultracold atomic systems to the level of single quanta has led to significant advances in quantum sensing, yet demonstrating a quantum advantage in real world applications by harnessing entanglement remains a core task. Here, we realize a many-body quantum-enhanced sensor to detect weak displacements and electric fields using a large crystal of \sim 150trapped ions. The center of mass vibrational mode of the crystal serves as high-Q mechanical oscillato...
Source
This website uses cookies.
We use cookies to improve your online experience. By continuing to use our website we assume you agree to the placement of these cookies.
To learn more, you can find in our Privacy Policy.