FOMO2022 Invited Talk,  Wolf von Klitzing

Invited Talk: Matter-Waves lensing in Dynamic Wave-Guides

Giannis Drougakis1,Saurabh Pandey1,2,4, Hector Mas1,3,5, Vishnupriya Puthiya Veettil1,  Georgios Vasilakis1, and Wolf von Klitzing1,† 

  1. Institute of Electronic Structure and Laser, Foundation for Research and Technology-Hellas, Heraklion 70013, Greece
  2. Department of Materials Science and Technology, University of Crete, Heraklion 70013, Greece
  3. Department of Physics, University of Crete, Heraklion 70013, Greece 
  4. Physics Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
  5. Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California 91109, USA 

Mattewaves are promising candidates for the realization of extremely sensitive sensors. Some of the most sensitive and precise measurements to date of gravity[1],  inertia[2],  and rotation[3]  are based on matter-wave interferometry with free-falling atomic clouds. A critical requirement to achieve very high sensitivities is the long interrogation time, which consequently leads to experimental apparatus up to a hundred meters tall or the requirement for experiments to be performed in microgravity in space[4—7].  To tackle this problem, the gravitational acceleration must be cancelled, e.g. by manipulating atomic waves in time-changeable traps and waveguides [8].

We have recently demonstrated smooth and controllable matter-wave guides by transporting Bose-Einstein condensates (BECs) over macroscopic distances without any heating or decohering their internal quantum states [9]. A neutral-atom accelerator ring was utilized to bring BECs to very high speeds (up to 16 times their sound velocity) and transport them in a magnetic matter-wave guide for 15 centimetres whilst fully preserving their internal coherence. We then use a magnetogravitational matter-wave lens to collimate and focus matterwaves in ring-shaped time-averaged adiabatic potentials. This “Delta-kick cooling” sequence of Bose-Einstein condensates reduces their expansion energies by a factor of 46 down to 800 pK. Compared to the state-of-the-art experiments, requiring zero gravity or large free-flight distances, the ring-shaped atomtronic circuit has a diameter of less than one millimetre and exhibits a high level of control, providing an important step toward atomtronic quantum sensors and the investigation of very low energy effects in ultra-cold atoms.

In this presentation, I will demonstrate a new fundamental limit for the coherent propagation in an imperfect matterwave guide.

Figure: The focus of a BEC in a matter wave guide based  on Time-Averaged Adiabatic Potentials


1. Rosi, G., Sorrentino, F., Cacciapuoti, L., Prevedelli, M. & Tino, G. M. Precision measurement of the Newtonian gravitational constant using cold atoms. Nature 510, 518–521 (2014).

2. Geiger, R. et al. Detecting inertial effects with airborne matter-wave interferometry. NatCommun. 2, 474 (2011). 

3. Dutta, I. et al. Continuous cold-atom inertial sensor with 1 nrad/sec rotation stability. Phys. Rev. Lett116, 183003 (2016). 

4. Kovachy, T. et al. Quantum superposition at the half-metre scale. Nature 528, 530–533 (2015). 

5. van Zoest, T. et al. Bose–Einstein condensation in microgravity. Science 328, 1540–1543 (2010). 

6. Barrett, B. et al. Dual matter-wave inertial sensors in weightlessness. Nat. Commun7, 13786 (2016).

7. Soriano, M. et al. Cold atom laboratory mission system design. In 2014 IEEE Aerospace Conference 1–11 (IEEE, 2014). 

8. Wang, Y. J. et al. Atom Michelson interferometer on a chip using a Bose–Einstein condensate. Phys. Rev. Lett94, 090405 (2005). 

9. Saurabh Pandey, Hector Mas, Giannis Drougakis, Premjith Thekkeppatt, Vasiliki Bolpasi, Georgios Vasilakis, Konstantinos Poulios, and Wolf von Klitzing Hypersonic Bose–Einstein condensates in accelerator rings Nature  570:7760 205–209 (2019)

10. Saurabh Pandey et al. Atomtronic Matter-Wave Lensing  Phys. Rev. Let.   126 17  (2021)  

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