All Outputs (73)

Decoherence of Bose-Einstein condensates in microtraps. (2004)
Journal Article
Henkel, C., & Gardiner, S. (2004). Decoherence of Bose-Einstein condensates in microtraps. Physical Review A, 69(4), https://doi.org/10.1103/physreva.69.043602

We discuss the impact of thermally excited near fields on the coherent expansion of a condensate in a miniaturized electromagnetic trap. Monte Carlo simulations are compared with a kinetic two-component theory and indicate that atom interactions can... Read More about Decoherence of Bose-Einstein condensates in microtraps..

(De)coherence Physics With Condensates In Microtraps (2004)
Journal Article
Henkel, C., Gardiner, S., & Negretti, A. (2004). (De)coherence Physics With Condensates In Microtraps. Laser Physics, 14(4), 615-620

We discuss the dynamics of a condensate in a miniaturized electromagnetic trap formed above a microstructured substrate. Recent experiments have found that trap lifetimes get reduced when approaching the substrate because atoms couple to thermally ex... Read More about (De)coherence Physics With Condensates In Microtraps.

Experimental observation of high-order quantum accelerator modes (2003)
Journal Article
Schlunk, S., d'Arcy, M., Gardiner, S., & Summy, G. (2003). Experimental observation of high-order quantum accelerator modes. Physical Review Letters, 90, https://doi.org/10.1103/physrevlett.90.124102

Using a freely falling cloud of cold cesium atoms periodically kicked by pulses from a vertical standing wave of laser light, we present the first experimental observation of high-order quantum accelerator modes. This confirms the recent prediction b... Read More about Experimental observation of high-order quantum accelerator modes.

Signatures of Quantum Stability in a Classically Chaotic System. (2003)
Journal Article
Schlunk, S., d'Arcy, M., Gardiner, S., Cassettari, D., Godun, R., & Summy, G. (2003). Signatures of Quantum Stability in a Classically Chaotic System. Physical Review Letters, 90(5), https://doi.org/10.1103/physrevlett.90.054101

We experimentally and numerically investigate the quantum accelerator mode dynamics of an atom optical realization of the quantum delta-kicked accelerator, whose classical dynamics are chaotic. Using a Ramsey-type experiment, we observe interference,... Read More about Signatures of Quantum Stability in a Classically Chaotic System..

(Quantum) chaos in Bose-Einstein condensates. (2002)
Journal Article
Gardiner, S. (2002). (Quantum) chaos in Bose-Einstein condensates. Journal of Modern Optics, 49(12), 1971-1977. https://doi.org/10.1080/09500340210140777

I discuss chaos in classical and quantum (wave) dynamics, extending this to considering chaotic dynamics in nonlinear wave equations, in particular how chaotic dynamics in the Gross-Pitaevskii equation relate to particle depletion from an initial Bos... Read More about (Quantum) chaos in Bose-Einstein condensates..

Quantum field theory of dilute homogeneous Bose-Fermi mixtures at zero temperature: General formalism and beyond mean-field corrections (2002)
Journal Article
Albus, A., Gardiner, S., Illuminati, F., & Wilkens, M. (2002). Quantum field theory of dilute homogeneous Bose-Fermi mixtures at zero temperature: General formalism and beyond mean-field corrections. Physical Review A, 65(5), https://doi.org/10.1103/physreva.65.053607

We consider a dilute homogeneous mixture of bosons and spin-polarized fermions at zero temperature. We first construct the formal scheme for carrying out systematic perturbation theory in terms of single particle Green’s functions. We especially focu... Read More about Quantum field theory of dilute homogeneous Bose-Fermi mixtures at zero temperature: General formalism and beyond mean-field corrections.

Approaching classicality in quantum accelerator modes through decoherence. (2001)
Journal Article
d'Arcy, M., Godun, R., Oberthaler, M., Summy, G., Burnett, K., & Gardiner, S. (2001). Approaching classicality in quantum accelerator modes through decoherence. Physical review E: Statistical, nonlinear, and soft matter physics, 64(5), https://doi.org/10.1103/physreve.64.056233

We describe measurements of the mean energy of an ensemble of laser-cooled atoms in an atom optical system in which the cold atoms, falling freely under gravity, receive approximate δ-kicks from a pulsed standing wave of laser light. We call this sys... Read More about Approaching classicality in quantum accelerator modes through decoherence..

Uniting Bose-Einstein Condensates in Optical Resonators. (2001)
Journal Article
Jaksch, D., Gardiner, S., Schulze, K., Cirac, J., & Zoller, P. (2001). Uniting Bose-Einstein Condensates in Optical Resonators. Physical Review Letters, 86(21), 4733-4736. https://doi.org/10.1103/physrevlett.86.4733

The relative phase of two initially independent Bose-Einstein condensates can be laser cooled to unite the two condensates by putting them into a ring cavity and coupling them with an internal Josephson junction. First, we show that this phase coolin... Read More about Uniting Bose-Einstein Condensates in Optical Resonators..

Cavity-assisted quasiparticle damping in a Bose-Einstein condensate. (2001)
Journal Article
Gardiner, S., Gheri, K., & Zoller, P. (2001). Cavity-assisted quasiparticle damping in a Bose-Einstein condensate. Physical Review A, 63(5), https://doi.org/10.1103/physreva.63.051603

We consider an atomic Bose-Einstein condensate held within an optical cavity and interacting with laser fields. We show how the interaction of the cavity mode with the condensate can cause energy due to excitations to be coupled to a lossy cavity mod... Read More about Cavity-assisted quasiparticle damping in a Bose-Einstein condensate..

Nonlinear matter wave dynamics with a chaotic potential. (2000)
Journal Article
Gardiner, S., Jaksch, D., Dum, R., Cirac, J., & Zoller, P. (2000). Nonlinear matter wave dynamics with a chaotic potential. Physical Review A, 62(2), https://doi.org/10.1103/physreva.62.023612

We consider the case of a cubic nonlinear Schrödinger equation with an additional chaotic potential, in the sense that such a potential produces chaotic dynamics in classical mechanics. We derive and describe an appropriate semiclassical limit to suc... Read More about Nonlinear matter wave dynamics with a chaotic potential..

Quantum Chaos in an Ion Trap: The Delta-Kicked Harmonic Oscillator. (1997)
Journal Article
Gardiner, S., Cirac, J., & Zoller, P. (1997). Quantum Chaos in an Ion Trap: The Delta-Kicked Harmonic Oscillator. Physical Review Letters, 79(24), 4790-4793. https://doi.org/10.1103/physrevlett.79.4790

We propose an experimental configuration, within an ion trap, by which a quantum mechanical delta-kicked harmonic oscillator could be realized, and investigated. We show how to directly measure the sensitivity of the ion motion to small variations in... Read More about Quantum Chaos in an Ion Trap: The Delta-Kicked Harmonic Oscillator..

Nonclassical states and measurement of general motional observables of a trapped ion. (1997)
Journal Article
Gardiner, S., Cirac, J., & Zoller, P. (1997). Nonclassical states and measurement of general motional observables of a trapped ion. Physical Review A, 55(3), 1683-1694. https://doi.org/10.1103/physreva.55.1683

We describe a method to perform a single quantum measurement of an arbitrary motional observable of a single ion moving in a harmonic potential. We illustrate the measurement procedure with explicit examples, namely the position and phase observables... Read More about Nonclassical states and measurement of general motional observables of a trapped ion..

Decoherence, continuous observation, and quantum computing: A cavity QED model. (1995)
Journal Article
Pellizzari, T., Gardiner, S., Cirac, J., & Zoller, P. (1995). Decoherence, continuous observation, and quantum computing: A cavity QED model. Physical Review Letters, 75(21), 3788-3791. https://doi.org/10.1103/physrevlett.75.3788

We use the theory of continuous measurement to analyze the effects of decoherence on a realistic model of a quantum computer based on cavity QED. We show how decoherence affects the computation, and methods to prevent it.