Our latest PRL entitled “Atomtronic Matter-Wave Lensing”, which has just been published in Physical Review Letters, is featured as a synopsis in Physics.APS.org with the catchy title: “How to Focus a Bose-Einstein Condensate in a Waveguide”.
Saurabh was the driving force behind this. He believed that this paper could go far and made sure that these great results get the attention it deserves. The effort paid of — thanks and congratulations to the whole team!
Atomtronic Matter-Wave Lensing
Saurabh Pandey, Hector Mas, Georgios Vasilakis, and Wolf von Klitzing
Phys. Rev. Lett. 126, 170402 (2021)
Published April 28, 2021
Vangelis Tzardis is has been accepted a the PhD in Frederick University in Cyprus to work on the identification and prediction of brain tumors from MR images.
Congratulations from the BEC team!
Good news: Our new ESA project: Greek InfrAstructure for Satellite as a Service: GIASaaS (headed by OHB-Hellas) has been selected for evaluation!
Our article ‘ELGAR—a European Laboratory for Gravitation and Atom-interferometric Research’ has just appeared in Classical and Quantum Gravity:
ELGAR — a European Laboratory for Gravitation and Atom-interferometric Research
B. Canuel, S. Abend, P. Amaro-Seoane, F. Badaracco, Q. Beaufils, A. Bertoldi, K. Bongs, P. Bouyer, C. Braxmaier, W. Chaibi, N. Christensen, F. Fitzek, G. Flouris, N. Gaaloul, S. Gaffet, C. L. G. Alzar, R. Geiger, S. Guellati-Khelifa, K. Hammerer, J. Harms, J. Hinderer, M. Holynski, J. Junca, S. Katsanevas, C. Klempt, C. Kozanitis, M. Krutzik, A. Landragin, I. L. Roche, B. Leykauf, Y.-H. Lien, S. Loriani, S. Merlet, M. Merzougui, M. Nofrarias, P. Papadakos, F. P. dos Santos, A. Peters, D. Plexousakis, M. Prevedelli, E. M. Rasel, Y. Rogister, S. Rosat, A. Roura, D. O. Sabulsky, V. Schkolnik, D. Schlippert, C. Schubert, L. Sidorenkov, J.-N. Siemß, C. F. Sopuerta, F. Sorrentino, C. Struckmann, G. M. Tino, G. Tsagkatakis, A. Vicere, W. von Klitzing, L. Woerner, and X. Zou
Classical and Quantum Gravity 37 225017 (2020)
Decoherence-free radiofrequency dressed subspaces
We study the spectral signatures and coherence properties of radiofrequency dressed hyperfine Zeeman sub-levels of 87Rb. Experimentally, we engineer combinations of static and RF magnetic fields to modify the response of the atomic spin states to environmental magnetic field noise. We demonstrate analytically and experimentally the existence of ‘magic’ dressing conditions where decoherence due to electromagnetic field noise is strongly suppressed. Building upon this result, we propose a bi-chromatic dressing configuration that reduces the global sensitivity of the atomic ground states to low-frequency noise, and enables the simultaneous protection of multiple transitions between the two ground hyperfine manifolds of atomic alkali species. Our methods produce protected transitions between any pair of hyperfine sub-levels at arbitrary (low) DC-magnetic fields.
Now on arXive !n
Our paper on the detection of gravitational waves using ground-based matterwave interferometers has just been accepted by Classical and Quantum Gravity:
Canuel et al 2020 Class. Quantum Grav. https://doi.org/10.1088/1361-6382/aba80e
Gravitational Waves (GWs) were observed for the first time in 2015, one century after Einstein predicted their existence. There is now growing interest to extend the detection bandwidth to low frequency. The scientific potential of multi-frequency GW astronomy is enormous as it would enable to obtain a more complete picture of cosmic events and mechanisms. This is a unique and entirely new opportunity for the future of astronomy, the success of which depends upon the decisions being made on existing and new infrastructures. The prospect of combining observations from the future space-based instrument LISA together with third generation ground based detectors will open the way towards multi-band GW astronomy, but will leave the infrasound (0.1 Hz to 10 Hz) band uncovered. GW detectors based on matter wave interferometry promise to fill such a sensitivity gap. We propose the European Laboratory for Gravitation and Atom-interferometric Research (ELGAR), an underground infrastructure based on the latest progress in atomic physics, to study space-time and gravitation with the primary goal of detecting GWs in the infrasound band. ELGAR will directly inherit from large research facilities now being built in Europe for the study of large scale atom interferometry and will drive new pan-European synergies from top research centers developing quantum sensors. ELGAR will measure GW radiation in the infrasound band with a peak strain sensitivity of 3.3×10-22/√Hz at 1.7 Hz. The antenna will have an impact on diverse fundamental and applied research fields beyond GW astronomy, including gravitation, general relativity, and geology.
In matterwave interferometry, atoms are put into a superposition of two different momentum states. They are then made to travel in two different paths (yes, during part of the interferometry sequence every individual atom is at two distinct places at the same time) before being recombined. Depending on the phase accumulated in the two different paths the atoms end up in two different distinguishable states. The accumulated phase is extremely sensitive to minute entry differences between the two paths travelled, making ultra-sensitive measurements of gravitation, acceleration, or rotation possible. Atoms, however, have the tendency to fall under the influence of earth’s gravitation. This means, that in order to measure at the highest precision, the apparatus has to be very large (some reaching tens or even one hundred of meters in height). The ideal solution would be to contain the atoms in waveguides (much like the optical fibres in optical gyroscopes). Until recently, this has not been possible, because even the smallest roughness in these guides destroys the coherence of the travelling matterwaves.
Our recent contributions
In a recent paper (published in Nature), we have demonstrated for the first time coherent guiding of matterwaves over macroscopic distances. This will make possible, for the first time ever, to perform guided matter-wave spectroscopy over macroscopic distances and in non-trivial geometries. This will greatly enhance the interaction time of the atoms and thus the sensitivity of matterwave interferometers.
The new PhD student will work together with our current Giannis Drougakis on the first guided matterwave interferometry. En route to this he/she will explore the limits on the roughness of waveguides, thus providing invaluable input to the design of any guided matterwave interferometer. The student(s) will work under the supervision of Wolf von Klitzing and Dimitris Papazoglou and be enrolled in the University of Crete
Vinay has joined us in March 2020 after some difficulty in bringing him from India to Greece (due to COVID 19 restrictions). He will work on Cavity enhanced Microscopy (CEMIC). He received his Master of Science in Physical Sciences from the Indian Institute of Science Education and Research, Kolkata (India) in Jun 2019.