-------- Weitergeleitete Nachricht --------

Betreff:	REMINDER Q-mat Colloquium by Florian Schreck at LUH, 10. April 2025, 4 pm
Datum:	Wed, 9 Apr 2025 09:24:23 +0200
Von:	Anke Schmidt <anke.schmidt@DQ-MAT.UNI-HANNOVER.DE>
Antwort an:	Anke Schmidt <anke.schmidt@DQ-MAT.UNI-HANNOVER.DE>
An:	MEMBERS-DQMAT@LISTSERV.UNI-HANNOVER.DE

Dear DQ-mat members and interested scientists,

We are are pleased to announce the next colloquium which will take place on

Thursday, 10. April 2025     
LUH, Building 1101, Room D326, Welfengarten 1, 30167 Hannover

Schedule for this day:

• 10-12: DQ-mat wide TG Meeting on "Designed quantum states for matter wave interferometry" with talks (20+5 min) by the following projects:
  
• A05: Rui Li
• B01: Martin Quensen
• B07: Vishu Gupta
• B09: Ali Lezeik
• 12-13: Lunch in mensa
• 13-15.30: Lab tours - please sign up here: https://seafile.projekt.uni-hannover.de/f/0dc2c96b5dbe4d0b9057/
  
• 15:30-16: Get-together with coffee and cake
• 16-17: Colloquium by Florian Schreck
• 17-18: PI Meeting and more discussions, coffee and cake (if there is anything left)

16:00-17:30 Colloquium by Florian Schreck - University of Amsterdam, Netherlands

Title: Continuous Bose-Einstein condensation and superradiant clocks

Abstract:

Ultracold quantum gases are excellent platforms for quantum simulation and sensing. So far these gases have been produced using time-sequential cooling stages and after creation they unfortunately decay through unavoidable loss processes. This limits what can be done with them. For example it becomes impossible to extract a continuous-wave atom laser, which has promising applications for precision measurement through atom interferometry [1]. I will present how we achieve continuous Bose-Einstein condensation and create condensates (BECs) that persist in a steady-state for as long as we desire. Atom loss is compensated by feeding fresh atoms from a continuously replenished thermal source into the BEC by Bose-stimulated gain [2]. We are now using our new techniques also to tackle another challenge: the creation of continuously operating optical atomic clocks, which promise higher measurement bandwidth and better short term stability than traditional optical clocks that operate in a pulsed manner [3,4,5,6]. I will present our progress in building superradiant and zero-deadtime clocks.

References

1. N. P. Robins, P. A. Altin, J. E. Debs, and J. D. Close, Atom lasers: Production, properties and prospects for precision inertial measurement, Physics Reports 529, 265 (2013).
2. C.-C. Chen, R. González Escudero, J. Minář, B. Pasquiou, S. Bennetts, and F. Schreck, Continuous Bose-Einstein condensation, Nature 606, 683 (2022).
3. M. A. Norcia, M. N. Winchester, J. R. K. Cline, and J. K. Thompson, Superradiance on the millihertz linewidth strontium clock transition, Sci. Adv. 2, e1601231 (2016).
4. J. Chen, Active Optical Clock, Chinese Science Bulletin 54, 348 (2009).
5. D. Meiser, J. Ye, D. R. Carlson, M. J. Holland, Prospects for a Millihertz-Linewidth Laser, PRL 102, 163601 (2009).
6. M. Schioppo et al., Ultrastable optical clock with two cold-atom ensembles, Nature Photonics 11, 48 (2017).

Access data for the transfer:
Zoom Access: https://us04web.zoom.us/j/932734874

This talk is part of the "Virtual Seminar on Precision Physics and Fundamental Symmetries" series and of the SFB DQ-mat colloquium series:https://indico.cern.ch/category/12183/

Best regard,

Anke Schmidt

-- 
Leibniz Universität Hannover
DQ-Mat-Office, Room 308
Callinstraße 36
30167 Hannover
Tel: +49 511 76214887
Fax: +49 511 76217243
Email: anke.schmidt@dq-mat.uni-hannover.de


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