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Colloquium Institute of Laser Physics, Universität Hamburg, May 11, 2011, Hamburg, Germany

Thu, 2011-10-06 12:16 - Donatella Rosetti

G. Rempe (P3b MPQ), colloquium, From Quantum Interconnects to Quantum Internets

Cluster Meeting on Quantum Information Processing and Communication, April 14 - 15, 2011, Warsaw, Poland

Thu, 2011-10-06 12:10 - Donatella Rosetti

G. Rempe (P3b MPQ), talk, Hybrid Quantum Systems and Interconnects

Niels Bohr Institute, Copenhagen University, March 8, 2011, Copenhagen, Denmark

Thu, 2011-10-06 11:48 - Donatella Rosetti

G. Rempe (P3b MPQ), seminar, Entanglement Distribution between Atomic Systems

Young Atom Opticians Conference 2011, February 11 - 18, 2011, Hannover, Germany

Thu, 2011-10-06 11:44 - Donatella Rosetti

C. Nölleke (P3b MPQ), talk, A Single-Atom Quantum Memory

H. Chibani (P3b MPQ), poster, A new cavity QED apparatus at work

M. Martinez-Dorantes (P6 UBONN), poster, Towards photon storage in small atomic ensembles using optical fiber Fabry-Perot Resonators

Th. Schumm (P12 TUWIEN), invited talk, Non-linear atom optic with artom chips

National Instruments, VIP 2011 - Virtuelle in der praxis, October 28, 2010, Fürstenfeldbruck, Germany

Thu, 2011-10-06 11:34 - Donatella Rosetti

C. Sames (P3b MPQ), talk, FPGA-based Feedback Control of a Single Atom Trajectory

Feedback Cooling of a Single Neutral Atom

Wed, 2011-10-05 14:32 - Donatella Rosetti
Date: 
2010-10-21
Author(s): 

M. Koch, C. Sames, A. Kubanek, M. Apel, M. Balbach, A. Ourjoumtsev, P.W.H. Pinkse, G. Rempe

Reference: 

Physical Review Letters 105, 173003 (2010)
doi: 10.1103/PhysRevLett.105.173003

We demonstrate feedback cooling of the motion of a single rubidium atom trapped in a high-finesse optical resonator to a temperature of about 160  μK. Time-dependent transmission and intensity-correlation measurements prove the reduction of the atomic position uncertainty. The feedback increases the 1/e storage time into the 1 s regime, 30 times longer than without feedback.

Observation of squeezed light from one atom excited with two photons

Wed, 2011-10-05 14:30 - Donatella Rosetti
Date: 
2011-06-29
Author(s): 

A. Ourjoumtsev, A. Kubanek, M. Koch, C. Sames, P.W.H. Pinkse, G. Rempe, K. Murr

Reference: 

Nature 474, 623 (2011)
doi:10.1038/nature10170

Single quantum emitters such as atoms are well known as non-classical light sources with reduced noise in the intensity, capable of producing photons one by one at given times. However, the light field emitted by a single atom can exhibit much richer dynamics. A prominent example is the predicted ability of a single atom to produce quadrature-squeezed light, which has fluctuations of amplitude or phase that are below the shot-noise level. However, such squeezing is much more difficult to observe than the emission of single photons.

Feedback control of a single atom in an optical cavity

Wed, 2011-10-05 14:26 - Donatella Rosetti
Date: 
2011-02-12
Author(s): 

A. Kubanek, M. Koch, C. Sames, A. Ourjoumtsev, T. Wilk, P.W.H. Pinkse, G. Rempe

Reference: 

Applied Physics B 102, 433 (2011)
doi: 10.1007/s00340-011-4410-x

We discuss feedback control of the motion of a single neutral atom trapped inside a high-finesse optical cavity. Based on the detection of single photons from a probe beam transmitted through the cavity, the position of the atom in the trap is estimated. Following this information, the trapping potential is switched between a high and a low value in order to counteract the atomic motion. This allowed us to increase the storage time by about one order of magnitude.

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