Experimental control of transport resonances in a coherent quantum rocking ratchet

Abstract

The ratchet phenomenon is a means to get directed transport without net forces. Originally conceived to rectify stochastic motion and describe operational principles of biological motors, the ratchet effect can be used to achieve controllable coherent quantum transport. This transport is an ingredient of several perspective quantum devices including atomic chips. Here we examine coherent transport of ultra-cold atoms in a rocking quantum ratchet. This is realized by loading a rubidium atomic Bose-Einstein condensate into a periodic optical potential subjected to a biharmonic temporal drive. The achieved long-time coherence allows us to resolve resonance enhancement of the atom transport induced by avoided crossings in the Floquet spectrum of the system. By tuning the strength of the temporal modulations, we observe a bifurcation of a single resonance into a doublet. Our measurements reveal the role of interactions among Floquet eigenstates for quantum ratchet transport.

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Cited by in corpus (22)

• Adiabatic Perturbation Theory and Geometry of Periodically-Driven Systems
• Effective Floquet-Gibbs states for dissipative quantum systems
• Floquet dynamics in light-driven solids
• Topological pumping in a Floquet-Bloch band
• Spectroscopy and Directed Transport of Topological Solitons in Crystals of Trapped Ions
• Topological Floquet engineering using two frequencies in two dimensions
• SQUID ratchet: Statistics of transitions in dynamical localization
• Floquet engineering of individual band gaps in an optical lattice using a two-tone drive
• Brownian ratchets: How stronger thermal noise can reduce diffusion
• Non-monotonic temperature dependence of chaos-assisted diffusion in driven periodic systems
• Hamiltonian ratchets with ultra-cold atoms
• Two-electron-spin ratchets as a platform for microwave-free dynamic nuclear polarization of arbitrary material targets
• A regular Hamiltonian halting ratchet for matter wave transport
• Steering multiattractors to overcome parameter inaccuracy and noise effects
• A study of excess energy and decoherence factor of a qubit coupled to a one dimensional periodically driven spin chain
• Asymptotic theory of quasiperiodically driven quantum systems
• Transport and diffusion properties of Brownian particles powered by a rotating wheel
• Layered Chaos in Mean-field and Quantum Many-body Dynamics
• Avoided crossing and sub-Fourier sensitivity in driven quantum systems
• The transport phenomenon of inertia Brownian particles in a periodic potential with non-Gaussian noise
• Compact setup for the production of ${}^{87}$Rb $|F=2,m_F=+2⟩$ Bose-Einstein condensates in a hybrid trap
• Can a periodically driven particle resist laser cooling and noise?