A5010819243- Cold Atom Physics and Bose-Einstein Condensates
- Advanced Frequency and Time Standards
- Atomic and Subatomic Physics Research
- Quantum Information and Cryptography
- Quantum optics and atomic interactions
- Photonic and Optical Devices
- Photonic Crystals and Applications
- Mechanical and Optical Resonators
- Advanced Fiber Laser Technologies
- Quantum, superfluid, helium dynamics
- Quantum Mechanics and Applications
- Quantum Computing Algorithms and Architecture
- Strong Light-Matter Interactions
- Spectroscopy Techniques in Biomedical and Chemical Research
- Radioactive Decay and Measurement Techniques
- Electrohydrodynamics and Fluid Dynamics
- Cardiovascular Syncope and Autonomic Disorders
- Quantum and electron transport phenomena
- Laser-Matter Interactions and Applications
- Geophysics and Sensor Technology
- Mass Spectrometry Techniques and Applications
- Nanopore and Nanochannel Transport Studies
- Orbital Angular Momentum in Optics
- Laser-induced spectroscopy and plasma
- Advanced Materials Characterization Techniques
Quantum Technologies (Sweden)
2025
Waseda University
2021-2022
Joint Institute for Laboratory Astrophysics
2018-2020
University of Colorado Boulder
2017-2020
National Institute of Standards and Technology
2017-2019
California Institute of Technology
2009-2017
The University of Tokyo
2008
We report observations of superradiance for atoms trapped in the near field a photonic crystal waveguide (PCW). By fabricating PCW with band edge D(1) transition atomic cesium, strong interaction is achieved between and guided-mode photons. Following short-pulse excitation, we record decay emission find superradiant rate scaling as Γ̅(SR)∝N̅Γ(1D) average atom number 0.19≲N̅≲2.6 atoms, where Γ(1D)/Γ'=1.0±0.1 peak single-atom radiative into guided mode, Γ' all other channels. These advances...
Strontium optical lattice clocks have the potential to simultaneously interrogate millions of atoms with a high spectroscopic quality factor $4 \times 10^{-17}$. Previously, atomic interactions forced compromise between clock stability, which benefits from large atom number, and accuracy, suffers density-dependent frequency shifts. Here, we demonstrate scalable solution takes advantage high, correlated density degenerate Fermi gas in three-dimensional guard against on-site interaction We...
We report the experimental realization of an optical trap that localizes single Cs atoms $\ensuremath{\simeq}215\text{ }\text{ }\mathrm{nm}$ from surface a dielectric nanofiber. By operating at magic wavelengths for pairs counterpropagating red- and blue-detuned trapping beams, differential scalar light shifts are eliminated, vector suppressed by $\ensuremath{\approx}250$. thereby measure absorption linewidth $\ensuremath{\Gamma}/2\ensuremath{\pi}=5.7\ifmmode\pm\else\textpm\fi{}0.1\text{...
Significance In recent years, there has been considerable effort to bring ultracold atoms into the realm of nanophotonics. Nanoscopic dielectric devices offer unprecedented opportunities engineer novel capabilities for control atom–photon interactions. particular, photonic crystals are periodic structures that display a bandgap where light cannot propagate and provide new setting coherent photon-mediated interactions between with tunable range. Here, we report initial observation cooperative...
We implement imaging spectroscopy of the optical clock transition lattice-trapped degenerate fermionic Sr in Mott-insulating regime, combining micron spatial resolution with submillihertz spectral precision. use these tools to demonstrate atomic coherence for up 15 s on and reach a record frequency precision 2.5×10−19. perform most rapid evaluation trapping light shifts 150 mHz linewidth, narrowest Rabi line shape observed coherent transition. The important emerging capability...
We report experimental observations of a large Bragg reflection from arrays cold atoms trapped near one-dimensional nanoscale waveguide. By using an optical lattice in the evanescent field surrounding nanofiber with period nearly commensurate resonant wavelength, we observe reflectance up to 75% for guided mode. Each atom behaves as partially reflecting mirror and ordered chain about 2000 is sufficient realize efficient mirror. Measurements spectra function probe polarization are reported....
Neutral atoms are among the leading platforms toward realizing fault-tolerant quantum computation (FTQC). However, scaling up a single neutral-atom device beyond <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline" overflow="scroll"><a:msup><a:mn>10</a:mn><a:mn>4</a:mn></a:msup></a:math> to meet demands of FTQC for practical applications remains challenge. To overcome this challenge, we clarify criteria and technological requirements further based on multiple neutral atom...
We demonstrate laser-field-free molecular orientation with the combination of a moderate electrostatic field and an intense nonresonant rapidly turned-off laser field, which can be shaped plasma shutter technique. use OCS (carbonyl sulfide) molecules as sample. Molecular is adiabatically created in rising part pulse, it found to revive at around rotational period molecule same degree that peak pulse virtually condition. This accomplishment means new class sample has become available for...
We present the first characterization of spectral properties superradiant light emitted from ultra-narrow, 1 mHz linewidth optical clock transition in an ensemble cold $^{87}$Sr atoms. Such a source has been proposed as next-generation active atomic frequency reference, with potential to enable high-precision references be used outside laboratory environments. By comparing our that state-of-the-art cavity-stabilized laser and lattice clock, we observe fractional Allan deviation $6.7(1)\times...
We investigate the effects of stimulated scattering optical lattice photons on atomic coherence times in a state-of-the art $^{87}\mathrm{Sr}$ clock. Such processes are found to limit achievable less than 12 s (corresponding quality factor $1\ifmmode\times\else\texttimes\fi{}{10}^{16}$), significantly shorter predicted 145(40) lifetime $^{87}\mathrm{Sr}$'s excited clock state. suggest that shallow, state-independent lattices with increased constants can give rise sufficiently small photon...
Photon recoil is one of the fundamental limitations for high-fidelity control trapped-atom qubits such as neutral atoms and trapped ions. In this work, we derive an analytical model efficiently evaluating motion-induced infidelity in remote entanglement generation protocols. Our applicable various photonic qubit encodings polarization, time-bin, frequency, with arbitrary initial motional states, thus providing a crucial theoretical tool realizing quantum networking. For case tweezer-trapped...
We propose a strategy to achieve laser-field-free molecular orientation with the combination of an electrostatic field and intense, nonresonant laser rapid turn off. The adiabatically created pendular state is effectively transferred rotational wave packet in nonadiabatic regime after off pulse achieved at peak revived period molecule same degree orientation. remarkable difference behavior found between alignment orientation, which reveals crucial importance sufficiently long rising time...
Laser trapping and interfacing of laser-cooled atoms in an optical fiber network is important tool for quantum information science. Following the pioneering work Balykin et al (2004 Phys. Rev. A 70 011401) Vetsch (2010 Lett. 104 203603), we propose a robust method single cesium with two-color state-insensitive evanescent wave around dielectric nanofiber. Specifically, show that vector light shifts (i.e. effective inhomogeneous Zeeman broadening ground states) induced by inherent ellipticity...
For single-photon generation based on cavity quantum electrodynamics, we investigate a practical model assuming Gaussian wavepacket. This makes it possible to comprehensively analyze the temporal dynamics of an atom-cavity system with both adiabatic and nonadiabatic conditions using analytical expressions. These results enable us clarify relationship between pulse width maximum success probability, over full range coupling regimes, for arbitrary detunings. We demonstrate how achieve high...
Microcavities with high Q factor and small mode volume have the potential to be efficient compact sources of photon pairs. Here, we demonstrate on-chip photon-pair generation by spontaneous four-wave mixing in a silica microtoroidal cavity obtain coincidence-to-accidental ratio 7.4 ± 0.1 pump power 46 µ W. The heralded photons also exhibit antibunching characterized autocorrelation function values <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:msubsup>...
Several errors in Refs. [1, 2] are corrected related to the optical trapping potentials for a state-insensitive, compensated nanofiber trap D2 transition of atomic Cesium. Section I corrects our basic formalism Ref. [1] calculating dipole-force potentials. II erroneous values partial lifetime and wavelength [1]. Sections III IV present figures various configurations considered [2], respectively.
Neutral atoms are among the leading platforms toward realizing fault-tolerant quantum computation (FTQC). However, scaling up a single neutral-atom device beyond $\sim 10^4$ to meet demands of FTQC for practical applications remains challenge. To overcome this challenge, we clarify criteria and technological requirements further based on multiple neutral atom processing units (QPUs) connected through photonic networking links. Our quantitative analysis shows that nanofiber optical cavities...
We present one-dimensional photonic crystal waveguides which can stably trap neutral atoms and achieve single-atom reflectivities of r0 ≳ 0.9, as well experimental progress towards fabrication optical testing such structures.