Improving the Q Factor of an Optical Atomic Clock Using Quantum Nondemolition Measurement

Quantum nondemolition (QND) measurement is a remarkable tool for the manipulation of quantum systems. It allows specific information to be extracted while still preserving fragile quantum observables of the system. Here we apply cavity-based QND measurement to an optical lattice clock—a type of atom...

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Autores principales:	William Bowden, Alvise Vianello, Ian R. Hill, Marco Schioppo, Richard Hobson
Formato:	article
Lenguaje:	EN
Publicado:	American Physical Society 2020
Materias:	Physics QC1-999
Acceso en línea:	https://doaj.org/article/6d5fde2e832d4247a8f075bac4a0db64
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id	oai:doaj.org-article:6d5fde2e832d4247a8f075bac4a0db64
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spelling	oai:doaj.org-article:6d5fde2e832d4247a8f075bac4a0db642021-12-02T13:27:32ZImproving the Q Factor of an Optical Atomic Clock Using Quantum Nondemolition Measurement10.1103/PhysRevX.10.0410522160-3308https://doaj.org/article/6d5fde2e832d4247a8f075bac4a0db642020-12-01T00:00:00Zhttp://doi.org/10.1103/PhysRevX.10.041052http://doi.org/10.1103/PhysRevX.10.041052https://doaj.org/toc/2160-3308Quantum nondemolition (QND) measurement is a remarkable tool for the manipulation of quantum systems. It allows specific information to be extracted while still preserving fragile quantum observables of the system. Here we apply cavity-based QND measurement to an optical lattice clock—a type of atomic clock with unrivaled frequency precision—preserving the quantum coherence of the atoms after readout with 80% fidelity. We apply this technique to stabilize the phase of an ultrastable laser to a coherent atomic state via a series of repeated QND measurements. We exploit the improved phase coherence of the ultrastable laser to interrogate a separate optical lattice clock, using a Ramsey spectroscopy time extended from 300 ms to 2 s. With this technique we maintain 95% contrast and observe a sevenfold increase in the clock’s Q factor to 1.7×10^{15}.William BowdenAlvise VianelloIan R. HillMarco SchioppoRichard HobsonAmerican Physical SocietyarticlePhysicsQC1-999ENPhysical Review X, Vol 10, Iss 4, p 041052 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physics QC1-999
spellingShingle	Physics QC1-999 William Bowden Alvise Vianello Ian R. Hill Marco Schioppo Richard Hobson Improving the Q Factor of an Optical Atomic Clock Using Quantum Nondemolition Measurement
description	Quantum nondemolition (QND) measurement is a remarkable tool for the manipulation of quantum systems. It allows specific information to be extracted while still preserving fragile quantum observables of the system. Here we apply cavity-based QND measurement to an optical lattice clock—a type of atomic clock with unrivaled frequency precision—preserving the quantum coherence of the atoms after readout with 80% fidelity. We apply this technique to stabilize the phase of an ultrastable laser to a coherent atomic state via a series of repeated QND measurements. We exploit the improved phase coherence of the ultrastable laser to interrogate a separate optical lattice clock, using a Ramsey spectroscopy time extended from 300 ms to 2 s. With this technique we maintain 95% contrast and observe a sevenfold increase in the clock’s Q factor to 1.7×10^{15}.
format	article
author	William Bowden Alvise Vianello Ian R. Hill Marco Schioppo Richard Hobson
author_facet	William Bowden Alvise Vianello Ian R. Hill Marco Schioppo Richard Hobson
author_sort	William Bowden
title	Improving the Q Factor of an Optical Atomic Clock Using Quantum Nondemolition Measurement
title_short	Improving the Q Factor of an Optical Atomic Clock Using Quantum Nondemolition Measurement
title_full	Improving the Q Factor of an Optical Atomic Clock Using Quantum Nondemolition Measurement
title_fullStr	Improving the Q Factor of an Optical Atomic Clock Using Quantum Nondemolition Measurement
title_full_unstemmed	Improving the Q Factor of an Optical Atomic Clock Using Quantum Nondemolition Measurement
title_sort	improving the q factor of an optical atomic clock using quantum nondemolition measurement
publisher	American Physical Society
publishDate	2020
url	https://doaj.org/article/6d5fde2e832d4247a8f075bac4a0db64
work_keys_str_mv	AT williambowden improvingtheqfactorofanopticalatomicclockusingquantumnondemolitionmeasurement AT alvisevianello improvingtheqfactorofanopticalatomicclockusingquantumnondemolitionmeasurement AT ianrhill improvingtheqfactorofanopticalatomicclockusingquantumnondemolitionmeasurement AT marcoschioppo improvingtheqfactorofanopticalatomicclockusingquantumnondemolitionmeasurement AT richardhobson improvingtheqfactorofanopticalatomicclockusingquantumnondemolitionmeasurement
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Improving the Q Factor of an Optical Atomic Clock Using Quantum Nondemolition Measurement

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