Direct comparison of a Ca^+ single-ion clock against a Sr lattice clock to verify the absolute frequency measurement

Matsubara, Kouki; Hachisu, Hidekazu; Liu, Ying; Nagano, S.; Locke, Clayton R.; Nogami, Asahiko; Kajita, Masatoshi; Hayasaka, Kazuhiro; Ido, T.; Hosokawa, Mizuhiko

doi:10.1364/oe.20.022034

Cited by 80 publications

(88 citation statements)

References 25 publications

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“…Frequency comparisons of optical clocks have been realized mostly on-campus [2,3,[5][6][7][8][9] except for two cases: one is a comparison of a 87 Sr lattice clock at JILA against a neutral Ca clock at NIST with a 4-km-long optical fiber link [10] and the other is between two 87 Sr lattice clocks at NICT and the University of Tokyo (UT) using a 60 km-long optical fiber [11]. Optical fiber links are promising on continental scales as demonstrated up to 1840 km [12].…”

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confidence: 99%

Direct comparison of optical lattice clocks with an intercontinental baseline of 9000 km

Hachisu¹,

Fujieda²,

Nagano³

et al. 2014

Opt. Lett.

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We have demonstrated a direct frequency comparison between two 87 Sr lattice clocks operated in intercontinentally separated laboratories in real time. Two-way satellite time and frequency transfer technique based on the carrier phase was employed for a direct comparison with a baseline of 9 000 km between Japan and Germany. A frequency comparison was achieved for 83 640 s resulting in a fractional difference of (1.1 ± 1.6) × 10 −15 , where the statistical part is the biggest contribution to the uncertainty. This measurement directly confirms the agreement of the two optical frequency standards on an intercontinental scale.

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mentioning

confidence: 99%

Direct comparison of optical lattice clocks with an intercontinental baseline of 9000 km

Hachisu¹,

Fujieda²,

Nagano³

et al. 2014

Opt. Lett.

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“…In particular, 40 Ca + has been used in the field of quantum computing and quantum information [28,29,30,31,32,33], for atomic clocks and the frequency standard [34,35,3,2,1,36,37] and recently as a single-atom heat engine [38]. The spectrum of 40 Ca + has been also employed in the quest for drifts of the fine structure constant over a time span of many billion years [39,40].…”

Section: The 40 Ca + Ionmentioning

confidence: 99%

“…High-performance frequency standards is the technological result of this precision leading to applications such as network synchronization and GPS [1]. This technology is enabled by atomic clocks [2,3]. High accuracy has implications in other fields of physics such as radioastronomy (verylong-baseline interferometry) [4], tests of general relativity [5], and particle physics [6].…”

Section: Introduction: Electronic Transitions and Spontaneous Emissiomentioning

confidence: 99%

Parameter estimation in atomic spectroscopy using exceptional points

2016

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Abstract. We suggest a method for accurate parameter estimation of atomic systems, employing the special properties of the exceptional points. The non-hermitian degeneracies at the exceptional points emerge from the description of the spontaneous emission of atomic system in the framework of an open quantum system, resulting in a non hermitian quantum master equation. The method is demonstrated for the atomic spectrum of S → P transitions of 85 Rb and 40 Ca + .

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“…9). Enfin, les premières comparaisons tout optique entre les horloges à réseau optique au strontium et au mercure LNE-SYRTE [26,35], le JILA (Colorado, États-unis) [36,37], la PTB (Allemagne) [29,30,38], l'Université de Tokyo (Japon) en 2006 et 2008 [39], le NICT (Japon) [40][41][42], le NMIJ (Japon) [43,44] et le NIM en 2015 (Chine) [45]. Un ajustement de ces mesures par une dérive linéaire dans le temps superposée à une variation sinusoïdale d'amplitude a calée sur la rotation de la Terre autour du soleil permet de contraindre la dérive du rapport de fréquence par d ln(ν Sr /ν Cs )/dt = −(1, 7 ± 0, 7) × 10 conduites au LNE-SYRTE permettent de s'affranchir des étalons micro-onde, et ainsi de démontrer une stabilité de fréquence dix fois meilleure, à quelques 10 −15 / √ τ.…”

Section: Comparaisons Locales D'horloges D'espèces Différentesunclassified

Horloges à réseau optique au strontium

Lodewyck¹,

Targat²,

Bilicki³

et al. 2016

R. franç. métrol.

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RésuméDans les horloges à réseau optique, des atomes froids confinés dans un piège dipolaire en forme de réseau sont interrogés par un laser ultrastable. Elles sont devenues les meilleurs étalons de fréquence car elles allient à la fois une résonance étroite dans le domaine optique, et donc grand facteur de qualité, et un grand nombre d'atomes interrogés simultanément. Dans cet article, nous présentons les derniers développements de ces horloges en termes de stabilité de fréquence et d'exactitude, en décrivant les résultats obtenus avec deux horloges à réseau optique au strontium développées au LNE-SYRTE. MOTS CLÉS : MÉTROLOGIE DU TEMPS ET DES FRÉQUENCES, HORLOGES À RÉSEAU OPTIQUE, ATOMES FROIDS, LASERS ULTRASTABLES. AbstractIn optical lattice clocks, an ensemble of cold neutral atoms confined in a lattice-shaped dipole trap are probed by an ultrastable laser. They have recently become the best frequency references, because they combine a narrow atomic resonance in the optical domain -hence a large quality factor -and a large number of simultaneously probed atoms. In this paper, we present the latest developments of these clocks, both in terms of frequency stability and accuracy, by focusing on two strontium optical lattice clocks under operation at LNE-SYRTE.

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Direct comparison of a Ca^+ single-ion clock against a Sr lattice clock to verify the absolute frequency measurement

Cited by 80 publications

References 25 publications

Direct comparison of optical lattice clocks with an intercontinental baseline of 9000 km

Direct comparison of optical lattice clocks with an intercontinental baseline of 9000 km

Parameter estimation in atomic spectroscopy using exceptional points

Horloges à réseau optique au strontium

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