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Integrated Quantum Clock

Deliverables

Risk management and quality assurance plan

To manage and support the project Quality Control, a documented Quality Assurance Plan will be set up and maintained to monitor all deliverables before finalising them. The deliverable also contains a detailed risk analysis and contingency planning as well as a description of the risk management procedures throughout the project lifetime.

Article on compact beam source

Design, construction and benchmarking of a compact, high-flux Sr beam source. Two approaches with different degree of risk and expected atom flux will be pursued. The low-risk approach is a miniaturized version of the existing UvA apparatus, which is expected to deliver a cold-atom flux of >108 88Sr/s. The higher-risk approach will use a heated sapphire Sr vapour cell [Sek17] inside a vacuum chamber to create a 2D MOT source with an estimated flux of >108 88Sr/s. A PD from UoB will be seconded to UvA and contribute know-how on integration. The testbed of T4.3 will be used for benchmarking the source.

Progress report on relevant real-life effects

We will characterise the important real-life effects for superradiant lasers on the 7.4-kHz 1S0-3P1 (WP4) and on the mHz 1S0-3P0 (WP5) transitions in Sr, as well as for cavity-enhanced spectroscopy for the second physical package of WP3. We will study these effects separately, investigate their physical role, and develop relevant computational methods to treat them.

Project handbook

To ensure a consistent implementation of the management of the project, UvA will produce a project procedure handbook that will be easily accessible to all Partners.

Detailed Dissemination and Engagement Plan

A detailed Dissemination and Engagement Plan will be composed.

Article on 87-Sr beam

We will demonstrate the production of dipole guided high phase-space density, high-brilliance beam of fermionic 87Sr. Such a beam would allow the construction of a superradiant laser without the need to apply a homogeneous magnetic field in the cavity. For 88Sr the magnetic field is needed to allow the clock transition, whereas in 87Sr the transition is allowed by hyperfine mixing. This task requires adding a second frequency component to all red MOT laser beams.

First Dissemination report

Halfway the project the first dissemination report will be written

Progress report on superradiant lasers' novel implementations

Task 6.4 targets the characterisation of new implementations of superradiant lasers in pulsed or CW operation. We plan to simulate novel implementation geometries with built-in repumping and cooling schemes to estimate their linewidth and power. The models include dipole-dipole interactions and collective level shifts.

Report on 88-Sr beam compatible with cavity

We will use the existing UvA apparatus (see Info Box 4) to demonstrate delivery of a high phase-space density, high-brilliance beam of 88Sr atoms in a dipole guide into a region that is protected from blue MOT straylight and sufficiently outside red MOT beams to allow placement of a cavity. This task requires reorienting the red MOT beams and shaping their intensity profiles. The new configuration will allow the placement of an aperture in between red MOT and the future cavity location, which would reduce red MOT stray light at the cavity location.

iqClock video

We will produce a video on the iqClock challenge and disseminate it on the iqClock website and YouTube.

Optical lattice clock test setup

Optical lattice clock as test setup suitable for industry-provided components and modules as well as for cavity-assisted spectroscopy later on.

Data Management Plan

iqClock will, in accordance with the EU policies on proper and responsible data management, set up a Data Management Plan (DMP), following the FAIR principles (Findable, Accessible, Interoperable and reusable) and the Horizon 2020 Pilot on Open Research Data.

iqClock website

The website will be clear, informative, and constantly updated with news and upcoming events, to be used as a reference point for the project’s on-going activities. The website will also have a list of the scientific publications produced through the iqClock project as well as the published deliverables. It will be divided in two sections: a public area and an internal area for consortium purposes like document repository and collaborative workspace. The website will go live in M2 of the project, and be constantly updated.

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Publications

Continuous Guided Strontium Beam with High Phase-Space Density

Author(s): Chun-Chia Chen, Shayne Bennetts, Rodrigo González Escudero, Benjamin Pasquiou, Florian Schreck
Published in: Physical Review Applied, Issue 12/4, 2019, ISSN 2331-7019
DOI: 10.1103/physrevapplied.12.044014

Superradiant cooling, trapping, and lasing of dipole-interacting clock atoms

Author(s): Christoph Hotter, David Plankensteiner, Laurin Ostermann, Helmut Ritsch
Published in: Optics Express, Issue 27/22, 2019, Page(s) 31193, ISSN 1094-4087
DOI: 10.1364/oe.27.031193

Lasing on a narrow transition in a cold thermal strontium ensemble

Author(s): Stefan A. Schäffer, Mikkel Tang, Martin R. Henriksen, Asbjørn A. Jørgensen, Bjarke T. R. Christensen, Jan W. Thomsen
Published in: Physical Review A, Issue 101/1, 2020, ISSN 2469-9926
DOI: 10.1103/PhysRevA.101.013819

SAGE: A proposal for a space atomic gravity explorer

Author(s): Guglielmo M. Tino, Angelo Bassi, Giuseppe Bianco, Kai Bongs, Philippe Bouyer, Luigi Cacciapuoti, Salvatore Capozziello, Xuzong Chen, Maria L. Chiofalo, Andrei Derevianko, Wolfgang Ertmer, Naceur Gaaloul, Patrick Gill, Peter W. Graham, Jason M. Hogan, Luciano Iess, Mark A. Kasevich, Hidetoshi Katori, Carsten Klempt, Xuanhui Lu, Long-Sheng Ma, Holger Müller, Nathan R. Newbury, Chris W. Oates, Achim
Published in: The European Physical Journal D, Issue 73/11, 2019, ISSN 1434-6060
DOI: 10.1140/epjd/e2019-100324-6

Sisyphus optical lattice decelerator

Author(s): Chun-Chia Chen, Shayne Bennetts, Rodrigo González Escudero, Florian Schreck, Benjamin Pasquiou
Published in: Physical Review A, Issue 100/2, 2019, ISSN 2469-9926
DOI: 10.1103/physreva.100.023401

Characterisation and feasibility study for superradiant lasing in 40 Ca atoms

Author(s): A. Gogyan, G. Kazakov, M. Bober, M. Zawada
Published in: Optics Express, Issue 28/5, 2020, Page(s) 6881, ISSN 1094-4087
DOI: 10.1364/oe.381991

Subradiance in multiply excited states of dipole-coupled V-type atoms

Author(s): Raphael Holzinger, Laurin Ostermann, Helmut Ritsch
Published in: EPL (Europhysics Letters), Issue 128/4, 2019, Page(s) 44001, ISSN 1286-4854
DOI: 10.1209/0295-5075/128/44001

Cavity-enhanced optical clocks

Author(s): Stefan Alaric Schäffer
Published in: 2019

1000 times closer to a continuous atom laser

Author(s): Shayne Bennetts
Published in: 2019

An atomic marble run to unity phase-space density

Author(s): Chun-Chia Chen
Published in: 2019