Dark-State Cooling of Atoms by Superfluid Immersion

Griessner, A.; Daley, Andrew J.; Clark, Stephen R. L.; Jaksch, Dieter; Zoller, P.

doi:10.1103/physrevlett.97.220403

Cited by 80 publications

(96 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The above master equation can be realized by immersing atoms a moving in an optical lattice in a large BEC of atoms b [19]. The condensate interacts in the form of a contact potential with interspecies scattering length a ab with the atoms a, and acts as a bath of Bogoliubov excitations.…”

Section: B Implementationmentioning

confidence: 99%

“…Given that intraband dissipative processes are suppressed by momentum conservation [19], we focus on the inter-band decay, and within the rotating frame approximation write the Master-equation with…”

Section: Appendix B: Implementation Of the Bec Liouvillianmentioning

confidence: 99%

“…Coupling to the phonon reservoir -The dissipative step is implemented by immersing the system into a large homogeneous 3D condensate of a distinguishable species of atoms b, which acts as a reservoir of phonon modes [19]. The corresponding phonon Hamiltonian is given in the Bogoliubov approximation by .…”

Section: Appendix B: Implementation Of the Bec Liouvillianmentioning

confidence: 99%

“…Applying standard linearization schemes in the weakly interacting situations, allows us to determine the solution of the master equation (1), and we find that the steady state exhibits similar properties as bosons in thermal contact to a heat bath: in 3D the effect of the interaction can be understood in terms of a depletion of the condensate, while in 1D and 2D the system exhibits properties reminiscent of a Luttinger liquid or a Kosterlitz-Thouless critical phase at finite temperature. In particular, we give a physical realization in terms of cold bosonic atoms in an optical lattice by immersion in a superfluid bath [19]. As a second example we discuss a master equation whose steady state corresponds to an η-condensate [20,21], i.e.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Quantum states and phases in driven open quantum systems with cold atoms

et al. 2008

Self Cite

View full text Add to dashboard Cite

An open quantum system, whose time evolution is governed by a master equation, can be driven into a given pure quantum state by an appropriate design of the system-reservoir coupling. This points out a route towards preparing many body states and non-equilibrium quantum phases by quantum reservoir engineering. Here we discuss in detail the example of a driven dissipative Bose Einstein Condensate of bosons and of paired fermions, where atoms in an optical lattice are coupled to a bath of Bogoliubov excitations via the atomic current representing local dissipation. In the absence of interactions the lattice gas is driven into a pure state with long range order. Weak interactions lead to a weakly mixed state, which in 3D can be understood as a depletion of the condensate, and in 1D and 2D exhibits properties reminiscent of a Luttinger liquid or a KosterlitzThouless critical phase at finite temperature, with the role of the "finite temperature" played by the interactions.

show abstract

Section: B Implementationmentioning

confidence: 99%

Section: Appendix B: Implementation Of the Bec Liouvillianmentioning

confidence: 99%

Section: Appendix B: Implementation Of the Bec Liouvillianmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Quantum states and phases in driven open quantum systems with cold atoms

et al. 2008

Self Cite

View full text Add to dashboard Cite

show abstract

“…On the one hand, both decoherence and dissipation generally constitute the main obstacle to the realization of quantum computers and other quantum devices. On the other hand, recently there has been a series of very interesting proposals to exploit the interaction with the environment to dissipatively engineer challenging states of matter [4][5][6][7], and of works where the engineering of environments paved the way to the creation of entanglement and superpositions of quantum states [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Lindblad model of quantum Brownian motion

et al. 2016

View full text Add to dashboard Cite

The theory of quantum Brownian motion describes the properties of a large class of open quantum systems. Nonetheless, its description in terms of a Born-Markov master equation, widely used in the literature, is known to violate the positivity of the density operator at very low temperatures. We study an extension of existing models, leading to an equation in the Lindblad form, which is free of this problem. We study the dynamics of the model, including the detailed properties of its stationary solution, for both constant and position-dependent coupling of the Brownian particle to the bath, focusing in particular on the correlations and the squeezing of the probability distribution induced by the environment.

show abstract

Motional and Spin Dynamics of Individual Neutral Impurities in an Ultracold Gas

Schmidt¹,

Mayer²,

Lausch³

et al. 2019

Physica Status Solidi (b)

View full text Add to dashboard Cite

Recent studies on the dynamics of single, neutral impurities immersed in an ultracold gas are reviewed. This paradigmatic model system is realized by the controlled doping of single Caesium atoms into an ultracold Rubidium gas. Interaction between the impurity and the gas in both the motional and internal degrees of freedom is studied for a broad range of bath temperatures in the thermal and quantum‐degenerate regime. Tracing single‐atom diffusion it is found that, even for a granular bath, where the assumption of a continuous medium is not fulfilled, a modified Langevin equation yields excellent predictions for tracer diffusion. Numerical modeling of impurity dynamics in a three‐dimensional superfluid bath shows the emergence of a prethermalized state for intermediate times due to the existence of a superfluid critical momentum, while for lower dimensions the effect of thermal phonons dominates and obstructs the formation of such nonthermal states. Finally, unleashing the quasi‐spin degree of freedom, the authors observe and control spin‐exchange dynamics between individual impurities and the bath. Moreover, a regime of sympathetic impurity cooling is realized, where the internal‐state coherence of the impurity is preserved. In the future, control over the motional and spin‐degree of freedom will enable using individual impurities as thermalized, localized, minimally invasive quantum probes for a quantum fluid.

show abstract

Dark-State Cooling of Atoms by Superfluid Immersion

Cited by 80 publications

References 28 publications

Quantum states and phases in driven open quantum systems with cold atoms

Quantum states and phases in driven open quantum systems with cold atoms

Lindblad model of quantum Brownian motion

Motional and Spin Dynamics of Individual Neutral Impurities in an Ultracold Gas

Contact Info

Product

Resources

About