Geopotential measurements with synchronously linked optical lattice clocks

Takano, T.; Takamoto, Masao; Ushijima, Ichiro; Ohmae, Noriaki; Akatsuka, Tomoya; Yamaguchi, Atsushi; Kuroishi, Yuki; Munekane, Hiroshi; Miyahara, Basara; Katori, Hidetoshi

doi:10.1038/nphoton.2016.159

Cited by 202 publications

(161 citation statements)

References 44 publications

Supporting

Mentioning

157

Contrasting

Order By: Relevance

“…The static Stark shift can be better evaluated by placing electrodes on the vacuum chamber windows. The final limitation of the current setup is the temperature uniformity of the vacuum chamber leading to a total BBR contrib ution with a fractional uncertainty of 2.5 10 17 × − . Improving the thermal isolation from environment and heat sources (e.g.…”

Section: Discussionmentioning

confidence: 99%

“…Figure 7 We calculated the E1 magic frequency from the meas ured linear coefficient a, the measured shift at the working point, and the nonlinear corrections. For our system it is 394 798.205 (17) GHz. This measurement of the magic fre quency and the ones reported before [8,24] are not consistent with each other as they could depend on the spectral features of the titanium sapphire lasers if not filtered [38].…”

Section: Lattice Light Shiftsmentioning

confidence: 99%

See 1 more Smart Citation

Absolute frequency measurement of the ${{}^{1}}{{\text{S}}_{0}}$ – ${{}^{3}}{{\text{P}}_{0}}$ transition of¹⁷¹Yb

et al. 2017

View full text Add to dashboard Cite

We report the absolute frequency measurement of the unperturbed transition S 1 0 -P 3 0 at 578 nm in 171 Yb realized in an optical lattice frequency standard relative to a cryogenic caesium fountain. The measurement result is 518 295 836 590 863.59(31) Hz with a relative standard uncertainty of 5.9 10 16 × − . This value is in agreement with the ytterbium frequency recommended as a secondary representation of the second in the International System of Units.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Lattice Light Shiftsmentioning

confidence: 99%

Absolute frequency measurement of the ${{}^{1}}{{\text{S}}_{0}}$ – ${{}^{3}}{{\text{P}}_{0}}$ transition of¹⁷¹Yb

et al. 2017

View full text Add to dashboard Cite

show abstract

“…Also, they are highly interesting for frequency metrology and time keeping in creating a consistent worldwide network of the next-generation ultraprecise clocks. Although comparisons at the full performance level of state-of-the-art optical clocks are possible on a continental scale [18,19] through a few specialized optical fiber links [20][21][22], intercontinental links are so far restricted to satellite-based methods that cannot fully exploit the clock performance [23]. A transfer standard enables world-wide interconnections between optical clocks and will thus benefit the efforts towards a redefinition of the SI second.…”

Section: Pacs Numbersmentioning

confidence: 99%

“…This has triggered a discussion about a redefinition of the SI second [7,8], pushes the frontiers of precision spectroscopy and tests fundamental physics [9][10][11][12][13][14], and enables chronometric leveling [15][16][17][18][19], where gravitational redshifts are exploited to measure height differences.…”

Section: Pacs Numbersmentioning

confidence: 99%

Transportable Optical Lattice Clock with7×10−17Uncertainty

et al. 2017

View full text Add to dashboard Cite

We present a transportable optical clock (TOC) with 87 Sr. Its complete characterization against a stationary lattice clock resulted in a systematic uncertainty of 7.4 × 10 −17 which is currently limited by the statistics of the determination of the residual lattice light shift. The measurements confirm that the systematic uncertainty is reduceable to below the design goal of 1 × 10 −17 . The instability of our TOC is 1.3 × 10 −15 / √ τ . Both, the systematic uncertainty and the instability are to our best knowledge currently the best achieved with any type of transportable clock. For autonomous operation the TOC is installed in an air-conditioned car-trailer. It is suitable for chronometric leveling with sub-meter resolution as well as intercontinental cross-linking of optical clocks, which is essential for a redefiniton of the SI second. In addition, the TOC will be used for high precision experiments for fundamental science that are commonly tied to precise frequency measurements and it is a first step to space borne optical clocks. PACS numbers:The best clocks in the world reach a fractional systematic uncertainty at the low 10 −18 level [1-4] and instabilities near or even below 10 2,[4][5][6], surpassing the clocks realizing the SI second in both by two orders of magnitude. This has triggered a discussion about a redefinition of the SI second [7,8], pushes the frontiers of precision spectroscopy and tests fundamental physics [9][10][11][12][13][14], and enables chronometric leveling [15][16][17][18][19], where gravitational redshifts are exploited to measure height differences.So far, the operation of optical clocks has been constrained to laboratories. However, transportable clocks are required for the necessary flexibility in the choice of measurement sites for applications like chronometric leveling. Also, they are highly interesting for frequency metrology and time keeping in creating a consistent worldwide network of the next-generation ultraprecise clocks. Although comparisons at the full performance level of state-of-the-art optical clocks are possible on a continental scale [18,19] through a few specialized optical fiber links [20][21][22], intercontinental links are so far restricted to satellite-based methods that cannot fully exploit the clock performance [23]. A transfer standard enables world-wide interconnections between optical clocks and will thus benefit the efforts towards a redefinition of the SI second.Making laboratory setups compact and robust for transport is also the first step towards granting a wide community of users access to these devices [24][25][26]. Furthermore, transportability is a first step towards applications of optical clocks in space. Developments in these directions are ongoing for optical lattice clocks (OLCs) with strontium [27,28]; however, to our knowledge the single-ion clock reported recently [29] is the only other transportable clock with uncertainty below 10 −16 .The requirements on such a TOC are challenging indeed: To enable comparisons of other optical cl...

show abstract

“…An important advantage of the atomic clock scheme over other Doppler tracking methods is that one has full control over the frequency references. As a result, synchronized measurement sequences can be applied at both ends of the baseline to cancel laser frequency noise [21,[27][28][29][30]: thus the atomic clock technique requires only two spacecraft, not three, and the differential measurement is entirely limited by the internal atomic transition, not the stability of the local oscillator used to probe it [10][11][12][13][14][15]. Furthermore, dynamical decoupling (DD) control sequences can be applied to the internal states of the atoms [31,32], extending the range of GW frequencies to which the detector can be maximally sensitive, from milliHertz to tens of Hertz, without requiring any physical changes to the detector.…”

Section: Introductionmentioning

confidence: 99%

Gravitational wave detection with optical lattice atomic clocks

et al. 2016

View full text Add to dashboard Cite

We propose a space-based gravitational wave (GW) detector consisting of two spatially separated, dragfree satellites sharing ultrastable optical laser light over a single baseline. Each satellite contains an optical lattice atomic clock, which serves as a sensitive, narrowband detector of the local frequency of the shared laser light. A synchronized two-clock comparison between the satellites will be sensitive to the effective Doppler shifts induced by incident GWs at a level competitive with other proposed space-based GW detectors, while providing complementary features. The detected signal is a differential frequency shift of the shared laser light due to the relative velocity of the satellites, and the detection window can be tuned through the control sequence applied to the atoms' internal states. This scheme enables the detection of GWs from continuous, spectrally narrow sources, such as compact binary inspirals, with frequencies ranging from ∼3 mHz-10 Hz without loss of sensitivity, thereby bridging the detection gap between spacebased and terrestrial optical interferometric GW detectors. Our proposed GW detector employs just two satellites, is compatible with integration with an optical interferometric detector, and requires only realistic improvements to existing ground-based clock and laser technologies.

show abstract

Geopotential measurements with synchronously linked optical lattice clocks

Cited by 202 publications

References 44 publications

Absolute frequency measurement of the ${{}^{1}}{{\text{S}}_{0}}$ – ${{}^{3}}{{\text{P}}_{0}}$ transition of¹⁷¹Yb

Absolute frequency measurement of the ${{}^{1}}{{\text{S}}_{0}}$ – ${{}^{3}}{{\text{P}}_{0}}$ transition of¹⁷¹Yb

Transportable Optical Lattice Clock with7×10−17Uncertainty

Gravitational wave detection with optical lattice atomic clocks

Contact Info

Product

Resources

About

Geopotential measurements with synchronously linked optical lattice clocks

Cited by 202 publications

References 44 publications

Absolute frequency measurement of the ${{}^{1}}{{\text{S}}_{0}}$ – ${{}^{3}}{{\text{P}}_{0}}$ transition of171Yb

Absolute frequency measurement of the ${{}^{1}}{{\text{S}}_{0}}$ – ${{}^{3}}{{\text{P}}_{0}}$ transition of171Yb

Transportable Optical Lattice Clock with7×10−17Uncertainty

Gravitational wave detection with optical lattice atomic clocks

Contact Info

Product

Resources

About

Absolute frequency measurement of the ${{}^{1}}{{\text{S}}_{0}}$ – ${{}^{3}}{{\text{P}}_{0}}$ transition of¹⁷¹Yb

Absolute frequency measurement of the ${{}^{1}}{{\text{S}}_{0}}$ – ${{}^{3}}{{\text{P}}_{0}}$ transition of¹⁷¹Yb