E. Oelker
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View article: 50-km fiber interferometer for testing gravitational signatures in quantum interference
50-km fiber interferometer for testing gravitational signatures in quantum interference Open
Quantum mechanics and general relativity are the foundational pillars of modern physics, yet experimental tests that combine the two frameworks remain rare. Measuring optical phase shifts of massless photons in a gravitational potential pr…
View article: Heisenberg Scaling in a Continuous-Wave Interferometer
Heisenberg Scaling in a Continuous-Wave Interferometer Open
Continuous-wave (CW) interferometry has stood at the frontier of precision measurement science since its inception, where it was used to search for the luminiferous ether, to the present day, where it forms the basis of interferometric gra…
View article: Excess Noise and Photoinduced Effects in Highly Reflective Crystalline Mirror Coatings
Excess Noise and Photoinduced Effects in Highly Reflective Crystalline Mirror Coatings Open
Thermodynamically induced length fluctuations of high-reflectivity mirror coatings put a fundamental limit on sensitivity and stability of precision optical interferometers like gravitational-wave detectors and ultrastable lasers. The main…
View article: Frequency stability of cryogenic silicon cavities with semiconductor crystalline coatings
Frequency stability of cryogenic silicon cavities with semiconductor crystalline coatings Open
State-of-the-art optical oscillators employing cryogenic reference cavities are limited in performance by the Brownian thermal noise associated with the mechanical dissipation of the mirror coatings. Recently, crystalline Al 1− x Ga x As/G…
View article: Excess noise and photo-induced effects in highly reflective crystalline mirror coatings
Excess noise and photo-induced effects in highly reflective crystalline mirror coatings Open
Thermodynamically induced length fluctuations of high-reflectivity mirror coatings put a fundamental limit on sensitivity and stability of precision optical interferometers like gravitational wave detectors and ultra-stable lasers. The mai…
View article: Frequency stability of cryogenic silicon cavities with semiconductor crystalline coatings
Frequency stability of cryogenic silicon cavities with semiconductor crystalline coatings Open
State-of-the-art optical oscillators employing cryogenic reference cavities are limited in performance by the Brownian thermal noise associated with the mechanical dissipation of the mirror coatings. Recently, crystalline Al$_{1-x}$Ga$_{x}…
View article: Resolving the gravitational redshift within a millimeter atomic sample
Resolving the gravitational redshift within a millimeter atomic sample Open
Einstein's theory of general relativity states that clocks at different gravitational potentials tick at different rates - an effect known as the gravitational redshift. As fundamental probes of space and time, atomic clocks have long serv…
View article: Precision Metrology Meets Cosmology: Improved Constraints on Ultralight Dark Matter from Atom-Cavity Frequency Comparisons
Precision Metrology Meets Cosmology: Improved Constraints on Ultralight Dark Matter from Atom-Cavity Frequency Comparisons Open
We conduct frequency comparisons between a state-of-the-art strontium optical lattice clock, a cryogenic crystalline silicon cavity, and a hydrogen maser to set new bounds on the coupling of ultralight dark matter to standard model particl…
View article: Optical atomic clock comparison through turbulent air
Optical atomic clock comparison through turbulent air Open
We use frequency comb-based optical two-way time-frequency transfer (O-TWTFT) to measure the optical frequency ratio of state-of-the-art ytterbium and strontium optical atomic clocks separated by a 1.5 km open-air link. Our free-space meas…
View article: Frequency Ratio Measurements with 18-digit Accuracy Using a Network of Optical Clocks
Frequency Ratio Measurements with 18-digit Accuracy Using a Network of Optical Clocks Open
Atomic clocks occupy a unique position in measurement science, exhibiting higher accuracy than any other measurement standard and underpinning six out of seven base units in the SI system. By exploiting higher resonance frequencies, optica…
View article: A tweezer clock with half-minute atomic coherence at optical frequencies\n and high relative stability
A tweezer clock with half-minute atomic coherence at optical frequencies\n and high relative stability Open
The preparation of large, low-entropy, highly coherent ensembles of identical\nquantum systems is foundational for many studies in quantum metrology,\nsimulation, and information. Here, we realize these features by leveraging the\nfavorabl…
View article: Quantum-Enhanced Advanced LIGO Detectors in the Era of Gravitational-Wave Astronomy
Quantum-Enhanced Advanced LIGO Detectors in the Era of Gravitational-Wave Astronomy Open
The Laser Interferometer Gravitational Wave Observatory (LIGO) has been directly detecting gravitational waves from compact binary mergers since 2015. We report on the first use of squeezed vacuum states in the direct measurement of gravit…
View article: Demonstration of a Timescale Based on a Stable Optical Carrier
Demonstration of a Timescale Based on a Stable Optical Carrier Open
We report on the first timescale based entirely on optical technology. Existing timescales, including those incorporating optical frequency standards, rely exclusively on microwave local oscillators owing to the lack of an optical oscillat…
View article: Seconds-scale coherence on an optical clock transition in a tweezer array
Seconds-scale coherence on an optical clock transition in a tweezer array Open
Building up an optical clock Arrays of optical tweezers can be used to trap atoms, which can then be manipulated individually. Such arrays have shown promise in quantum simulation of many-body systems. Norcia et al. now demonstrate that th…
View article: JILA SrI optical lattice clock with uncertainty of $2.0 \times 10^{-18}$
JILA SrI optical lattice clock with uncertainty of $2.0 \times 10^{-18}$ Open
We report on an improved systematic evaluation of the JILA SrI optical lattice clock, achieving a nearly identical uncertainty compared to the previous strontium record set by the JILA SrII optical lattice clock at . This improves upon the…
View article: Seconds-scale coherence on an optical clock transition in a tweezer array (publication data)
Seconds-scale coherence on an optical clock transition in a tweezer array (publication data) Open
Accompanying data for Seconds-scale coherence on an optical clock transition in a tweezer array.
View article: Seconds-scale coherence on an optical clock transition in a tweezer array (publication data)
Seconds-scale coherence on an optical clock transition in a tweezer array (publication data) Open
Accompanying data for Seconds-scale coherence on an optical clock transition in a tweezer array.
View article: Seconds-scale coherence on an optical clock transition in a tweezer array (publication data)
Seconds-scale coherence on an optical clock transition in a tweezer array (publication data) Open
Accompanying data for Seconds-scale coherence on an optical clock transition in a tweezer array.
View article: Demonstration of 4.8 × 10−17 stability at 1 s for two independent optical clocks
Demonstration of 4.8 × 10−17 stability at 1 s for two independent optical clocks Open
View article: Seconds-scale coherence in a tweezer-array optical clock
Seconds-scale coherence in a tweezer-array optical clock Open
Optical clocks based on atoms and ions achieve exceptional precision and accuracy, with applications to relativistic geodesy, tests of relativity, and searches for dark matter. Achieving such performance requires balancing competing desira…
View article: Crystalline optical cavity at 4 K with thermal-noise-limited instability and ultralow drift
Crystalline optical cavity at 4 K with thermal-noise-limited instability and ultralow drift Open
Crystalline optical cavities are the foundation of today’s state-of-the-art ultrastable lasers. Building on our previous silicon cavity effort, we now achieve the fundamental thermal-noise-limited stability for a 6 cm long silicon cavity c…
View article: Optical clock intercomparison with $6\times 10^{-19}$ precision in one hour
Optical clock intercomparison with $6\times 10^{-19}$ precision in one hour Open
Improvements in atom-light coherence are foundational to progress in quantum information science, quantum optics, and precision metrology. Optical atomic clocks require local oscillators with exceptional optical coherence due to the challe…
View article: Crystalline optical cavity at 4 K with thermal noise limited instability and ultralow drift
Crystalline optical cavity at 4 K with thermal noise limited instability and ultralow drift Open
Crystalline optical cavities are the foundation of today's state-of-the-art ultrastable lasers. Building on our previous silicon cavity effort, we now achieve the fundamental thermal noise-limited stability for a 6 cm long silicon cavity c…
View article: Ultrastable Silicon Cavity in a Continuously Operating Closed-Cycle Cryostat at 4 K
Ultrastable Silicon Cavity in a Continuously Operating Closed-Cycle Cryostat at 4 K Open
We report on a laser locked to a silicon cavity operating continuously at 4 K with 1×10^{-16} instability and a median linewidth of 17 mHz at 1542 nm. This is a tenfold improvement in short-term instability, and a 10^{4} improvement in lin…
View article: Ultra-low phase noise squeezed vacuum source for gravitational wave detectors
Ultra-low phase noise squeezed vacuum source for gravitational wave detectors Open
Squeezed states of light are a valuable resource for reducing quantum noise in precision measurements. Injection of squeezed vacuum states has emerged as an important technique for reducing quantum shot noise, which is a fundamental limita…
View article: Audio-Band Frequency-Dependent Squeezing for Gravitational-Wave Detectors
Audio-Band Frequency-Dependent Squeezing for Gravitational-Wave Detectors Open
Quantum vacuum fluctuations impose strict limits on precision displacement measurements, those of interferometric gravitational-wave detectors among them. Introducing squeezed states into an interferometer's readout port can improve the se…