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Identifier

000425072

Title

Guided matter-wave interferometry

Alternative Title

Καθοδηγούμενη συμβολομετρία υλικών κυμάτων

Author

Pandey, Saurabh

Thesis advisor

Παπάζογλου, Δημήτριος
Wolf von Klitzing

Reviewer

Σαββίδης, Παύλος
Κοπιδάκης, Γεώργιος
Κιοσέογλου, Γεώργιος
Μακρής, Κωνσταντίνος
Καβουλάκης, Γεώργιος

Abstract

Coherent guiding and manipulation of matter-waves is of utmost importance in the development of practical atomtronic sensors and devices. In this thesis, I present excitationless guiding of Bose-Einstein condensates (BECs) at hypersonic speeds in magnetic time-averaged adiabatic potential (TAAP) rings traps and waveguides. For the first time, matter-waves are transported for a record distance of 40 cm at hypersonic speeds without detecting any extra excitation when compared to the static case. To realize a rotation sensor utilizing the clock transition of Rubidium 87 (87Rb), I present trapping and manipulation of the spin states of 87Rb, in two arms of a ring trap. The extreme smoothness of TAAP rings is demonstrated via the propagation of BECs in the ring waveguide, measured smoothness is below 200 pK. In a different interferometer configuration, using optical beam splitters and guided matter-waves in a horizontal ring waveguide, I implemented delta-kick cooling technique to achieve compact atomic wave-packet guiding for seconds. The one-dimensional effective BEC temperature is lowered by a factor of 30, down to a few nanoKelvin. These demonstrations now provide a platform to realize highly sensitive, compact atomic rotation sensors, and investigate fundamental questions, e.g., superfluidity of BECs much above their critical velocity.

Language

English

Subject

Bose -einstein condensation

Delta-Kick cooling

Hypersonic transport

Laser cooling

Magnetic trapping

Ring waveguide

Time -averaged adiabatic potentials

Δακτυλιοειδής κυματοδηγός

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