Cooperativity in Highly Excited Rydberg
Ensembles — Control and Entanglement
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SA V — Rydberg interfaces and mechanical control

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Trapping atoms on a magnetic lattice atom chipMay 2013
Amsterdam, The Netherlands

Cold rubidium atoms were trapped on a new magnetic-film atom chip. The pattern of microtraps consists of two lattices, of hexagonal and square geometries respectively, joining in an interface. With a lattice spacing of 10 µm this is an excellent starting point to investigate Rydberg dipole blockade in and between these microtraps.

Measurement of 87-Rb Rydberg-state hyperfine splitting in a room-temperature vapor cellApril 2013
Amsterdam, The Netherlands

Hyperfine splittings of Rydberg s-states in 87Rb were measured using electromagnetically induced transparency (EIT) spectroscopy in a room-temperature vapor cell. In spite of Doppler broadening, an accuracy of 100 kHz was achieved. The top figure shows the splitting in a Stark map measurement for the 20s state. The bottom figure shows the differential hyperfine splitting (without the common Stark shift) of the F=2 state.

A. Tauschinsky, R. Newell, H. B van Linden van den Heuvell, R. J. C Spreeuw, Measurement of 87-Rb Rydberg-state hyperfine splitting in a room-temperature vapor cell, Phys. Rev. A, 87, 042522, or see our full list of publications
A new magnetic-film atom chipOctober 2012
Amsterdam, The Netherlands

A new magnetic-film atom chip was fabricated and installed in our vacuum system. The chip hosts square and triangular lattices of magnetic microtraps, spaced by 10 µm. These will be used to trap ensembles of 10-100 atoms and, using the Rydberg dipole blockade, create entangled states.

Atomic Rydberg reservoirs for polar moleculesMay 2012
Innsbruck, Austria

In the field of cold Rydberg atoms and molecules we presented a proposal to directly cool polar molecules by engineering an atomic reservoir for both elastic and inelastic collisions using laser‐dressed Rydberg atoms. Similar to a “collisional Sisyphus effect” a spontaneously emitted photon carries away (kinetic) energy of the collisional partners, leading to a significant energy loss in a single collision.

(Left) Hot molecules (red) collide with cold Rydberg-dressed atoms (blue). A spontaneously emitted photon carries away kinetic energy similar to a collisional Sisyphus effect.

B. Zhao, A. Glätzle, G. Pupillo, P. Zoller, Atomic Rydberg Reservoirs for Polar Molecules, Phys. Rev. Lett. 108 193007 (2012), or see our full list of publications
Trapping Rydberg atoms above the surface of a chipFebruary 2012
Zürich, Switzerland

Controlling the motion and the quantum state of atoms and molecules on the immediate vicinity of a surface is a prerequisite for quantum-information transfer between gas-phase particles and quantum dots located at the surface. At ETH Zürich, a new chip-based method has been developed to slow down supersonic beams of Rydberg atoms and molecules and to trap them above the surface of the chip. The method exploits the very large dipole moments of Rydberg atoms and molecules and the large inhomogeneous electric fields that can be generated above the surface of a chip with surface electrodes. In the experiment, a supersonic beam of hydrogen Rydberg atoms was decelerated from an initial velocity of 760 m/s to zero velocity and stored in an electric trap located just above the chip surface [1]. In complementary experiments, the quantum states of cold helium Rydberg atoms have been coherently manipulated with microwave fields emanating from microwave transmission lines mounted onto the chip surface [2], and the Zeeman effect in high Rydberg states of Cs has been studied at ultrahigh resolution using submillimeter-wave radiation and an ultracold Cs-atom sample in a MOT [3].

[1] S. D. Hogan, P. Allmendinger, H. Saßmannshausen, H. Schmutz, and F. Merkt, Surface-Electrode Rydberg-Stark Decelerator, Phys. Rev. Lett. 108, 063008 (2012)
[2] S. D. Hogan, J. A. Agner, F. Merkt, T. Thiele, S. Filipp, and A. Wallraff, Driving Rydberg-Rydberg Transitions from a Coplanar Microwave Waveguide, Phys. Rev. Lett. 108, 063004 (2012)
[3] J. Deiglmayr, H. Saßmannshausen and F. Merkt, High-resolution spectroscopy of Rydberg states in an ultracold cesium gas, Phys. Rev. A 87, 032519 (2013), or see our full list of publications
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