Positions at the University of Amsterdam (UvA)
Position R2-UvA has been filled, but applications are welcomed for the QuRIOUS PhD position R1-UvA hosted by the University of Amsterdam! To apply and find out more, please visit the UvA website.
Objectives:
1) Clock based on continuous, cavity-enhanced spectroscopy of Sr clock transition
We have pioneered a continuous ultracold and dense source of Sr atoms, which opens new possibilities for quantum science, as we demonstrated by showing continuous Bose-Einstein condensation. Within the iqClock and the QDNL projects, we have constructed a higher TRL version of this source with the ability to supply a constant atom beam to a science chamber equipped with a ring cavity. Task 1: The candidate will continuously load atoms into a slowly moving magic wavelength lattice in the ring cavity, by testing and improving on methods that TUW and we have devised and will further develop together with R11-TUW. Task 2: Once enough atoms can be continuously loaded into the ring cavity, the candidate will perform continuous cavity-enhanced spectroscopy to lock a clock laser to the Sr clock transition. We will benefit from exchanges with UCPH, who have demonstrated a similar, but pulsed scheme on a broader transition. Success will result in a comparatively simple continuous optical clock operating on a mHz linewidth transition.
2) Continuous superradiant lasing on Sr clock transition
Task 3: Continuing UvA’s and TUW’s prior work, the DC will implement and together with R11-TUW further develop methods preparing Sr atoms in the ring cavity into the excited clock state 3P0. Task 4: Once optical pumping works sufficiently well, the DC will inject the cavity with a low-power clock laser beam and demonstrate amplification of that beam, similar to UvA’s work on kHz-transition superradiant clocks. Task 5: The DC will achieve continuous superradiant lasing with theory support from TUW and UIBK and in discussions with UCPH, CNRS-LPL and CNRS-FEMTO (superradiant lasing requires enough flux of optically pumped atoms and good suppression of disturbing effects). These tasks will lay the foundations for a future clock based on continuous superradiant lasing. Clock performance will be characterized by comparison to an ultrastable resonator and to SYRTE’s or PTB’s clock, via the GÉANT fibre network.
1) Clock based on continuous, cavity-enhanced spectroscopy of Sr clock transition
We have pioneered a continuous ultracold and dense source of Sr atoms, which opens new possibilities for quantum science, as we demonstrated by showing continuous Bose-Einstein condensation. Within the iqClock and the QDNL projects, we have constructed a higher TRL version of this source with the ability to supply a constant atom beam to a science chamber equipped with a ring cavity. Task 1: The candidate will continuously load atoms into a slowly moving magic wavelength lattice in the ring cavity, by testing and improving on methods that TUW and we have devised and will further develop together with R11-TUW. Task 2: Once enough atoms can be continuously loaded into the ring cavity, the candidate will perform continuous cavity-enhanced spectroscopy to lock a clock laser to the Sr clock transition. We will benefit from exchanges with UCPH, who have demonstrated a similar, but pulsed scheme on a broader transition. Success will result in a comparatively simple continuous optical clock operating on a mHz linewidth transition.
2) Continuous superradiant lasing on Sr clock transition
Task 3: Continuing UvA’s and TUW’s prior work, the DC will implement and together with R11-TUW further develop methods preparing Sr atoms in the ring cavity into the excited clock state 3P0. Task 4: Once optical pumping works sufficiently well, the DC will inject the cavity with a low-power clock laser beam and demonstrate amplification of that beam, similar to UvA’s work on kHz-transition superradiant clocks. Task 5: The DC will achieve continuous superradiant lasing with theory support from TUW and UIBK and in discussions with UCPH, CNRS-LPL and CNRS-FEMTO (superradiant lasing requires enough flux of optically pumped atoms and good suppression of disturbing effects). These tasks will lay the foundations for a future clock based on continuous superradiant lasing. Clock performance will be characterized by comparison to an ultrastable resonator and to SYRTE’s or PTB’s clock, via the GÉANT fibre network.
Objectives:
1) Multi-ensemble clock spectroscopy
Within QDNL we have designed and started to build a clock using zero-deadtime clock spectroscopy. This clock is based on four protected spectroscopy zones, filled with atoms from a continuous ultracold Sr source similar to the one used by R1-UvA. Task 1: The DC will participate in the construction of the apparatus, including the conveyor belt lattices that will transfer atoms from the source into the interrogation zones. They will focus in particular on the laser system for non-demolition readout, similar to the readout demonstrated by CNRS-LTE in a pulsed optical clock . Task 2: The DC will transfer atoms into each one of the four interrogation zones and perform clock spectroscopy on atoms in one interrogation zone.
2) Zero-deadtime, non-demolition clock operation
Task 3: The DC will periodically load atoms into one of two interrogation zones, alternating between them, and optimize this transfer such that there are always atoms available for spectroscopy. This will enable the DC and his team to operate the clock with zero deadtime. Task 4: The DC will demonstrate non-demolition readout of one interrogation zone. Task 5: The DC will achieve zero-deadtime clock operation with non-demolition readout. This clock has the potential to average to a precision of 10-18 a hundred times faster than state-of-the-art clocks (2 minutes instead of 3 hours). The increased measurement bandwidth is highly beneficial for any clock application. Clock performance will be characterized by comparison to SYRTE’s or PTB’s clock, via the GÉANT fibre network.
1) Multi-ensemble clock spectroscopy
Within QDNL we have designed and started to build a clock using zero-deadtime clock spectroscopy. This clock is based on four protected spectroscopy zones, filled with atoms from a continuous ultracold Sr source similar to the one used by R1-UvA. Task 1: The DC will participate in the construction of the apparatus, including the conveyor belt lattices that will transfer atoms from the source into the interrogation zones. They will focus in particular on the laser system for non-demolition readout, similar to the readout demonstrated by CNRS-LTE in a pulsed optical clock . Task 2: The DC will transfer atoms into each one of the four interrogation zones and perform clock spectroscopy on atoms in one interrogation zone.
2) Zero-deadtime, non-demolition clock operation
Task 3: The DC will periodically load atoms into one of two interrogation zones, alternating between them, and optimize this transfer such that there are always atoms available for spectroscopy. This will enable the DC and his team to operate the clock with zero deadtime. Task 4: The DC will demonstrate non-demolition readout of one interrogation zone. Task 5: The DC will achieve zero-deadtime clock operation with non-demolition readout. This clock has the potential to average to a precision of 10-18 a hundred times faster than state-of-the-art clocks (2 minutes instead of 3 hours). The increased measurement bandwidth is highly beneficial for any clock application. Clock performance will be characterized by comparison to SYRTE’s or PTB’s clock, via the GÉANT fibre network.
For more information please contact Florian Schreck. Our group webpage is www.strontiumBEC.com and on it you will find further projects, which also have open PhD positions. To apply for one of the PhD positions, go to the vacancies on the UvA website. Candidates will be selected every two months and a new vacancy offer will be posted in case unfilled positions remain.
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