Details
| Original language | English |
|---|---|
| Qualification | Doctor rerum naturalium |
| Awarding Institution | |
| Supervised by |
|
| Date of Award | 15 Jun 2022 |
| Place of Publication | Hannover |
| Publication status | Published - 2022 |
Abstract
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Hannover, 2022. 113 p.
Research output: Thesis › Doctoral thesis
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TY - BOOK
T1 - Entangled momentum modes for atom interferometry
AU - Anders, Fabian
N1 - Doctoral thesis
PY - 2022
Y1 - 2022
N2 - Entangled ensembles have been created in versatile atomic systems and find a promising application in entanglement-enhanced metrology. Here, entangled spin-states have been successfully applied within interferometers that allow to measure magnetic fields and frequencies with enhanced sensitivities. In contrast, atom interferometers for the measurement of inertial forces and gravitational fields are operated in external degrees of freedom and span an area in space-time. To make use of entangled states here, the entanglement has to be generated among momentum modes with suitable spatial extent and velocity width. In this thesis, a source of momentum-entangled atoms that is compatible with present-day light-pulse atom interferometers is presented. Utilising a quasi-adiabatic ramp through a quantum phase transition, highly-entangled twin-Fock states are created in the internal spindegree of freedom of a 87Rb Bose-Einstein condensate. Hereon, the entanglement is successfully transferred to distinct momentum-modes by a stimulated Raman coupling and verified by the direct measurement of an entanglement criterion. The observed mode quality and the residual expansion demonstrate that this entangled source is wellsuited to the successive application in light-pulse atom interferometers and opens up a path to gravimetry beyond the standard quantum limit. Furthermore could the demonstrated techniques be employed to realise a scalable atomic Bell test. In the long run, similar entangled sources could specifically enhance the performance of gravity gradiometers, tests of the Einstein Equivalence Principle and future atomic gravitational wave detectors.
AB - Entangled ensembles have been created in versatile atomic systems and find a promising application in entanglement-enhanced metrology. Here, entangled spin-states have been successfully applied within interferometers that allow to measure magnetic fields and frequencies with enhanced sensitivities. In contrast, atom interferometers for the measurement of inertial forces and gravitational fields are operated in external degrees of freedom and span an area in space-time. To make use of entangled states here, the entanglement has to be generated among momentum modes with suitable spatial extent and velocity width. In this thesis, a source of momentum-entangled atoms that is compatible with present-day light-pulse atom interferometers is presented. Utilising a quasi-adiabatic ramp through a quantum phase transition, highly-entangled twin-Fock states are created in the internal spindegree of freedom of a 87Rb Bose-Einstein condensate. Hereon, the entanglement is successfully transferred to distinct momentum-modes by a stimulated Raman coupling and verified by the direct measurement of an entanglement criterion. The observed mode quality and the residual expansion demonstrate that this entangled source is wellsuited to the successive application in light-pulse atom interferometers and opens up a path to gravimetry beyond the standard quantum limit. Furthermore could the demonstrated techniques be employed to realise a scalable atomic Bell test. In the long run, similar entangled sources could specifically enhance the performance of gravity gradiometers, tests of the Einstein Equivalence Principle and future atomic gravitational wave detectors.
U2 - 10.15488/12802
DO - 10.15488/12802
M3 - Doctoral thesis
CY - Hannover
ER -