A5082974909- Cold Atom Physics and Bose-Einstein Condensates
- Advanced Frequency and Time Standards
- Atomic and Subatomic Physics Research
- X-ray Spectroscopy and Fluorescence Analysis
- Quantum optics and atomic interactions
- Advanced Fiber Laser Technologies
- Atomic and Molecular Physics
- Semiconductor Lasers and Optical Devices
- Electron and X-Ray Spectroscopy Techniques
- Nuclear Physics and Applications
- Nonlinear Optical Materials Research
- Cardiovascular Syncope and Autonomic Disorders
- Radar Systems and Signal Processing
- Ion-surface interactions and analysis
- Geophysics and Sensor Technology
- Strong Light-Matter Interactions
- Laser-induced spectroscopy and plasma
- Quantum Mechanics and Applications
- Advanced Photonic Communication Systems
- Quantum Information and Cryptography
- Laser Design and Applications
- Quantum Chromodynamics and Particle Interactions
- Advanced Chemical Physics Studies
- Network Time Synchronization Technologies
- Radiation Shielding Materials Analysis
University of Birmingham
2016-2025
Birmingham City University
2024
The Edgbaston Hospital
2022
Heinrich Heine University Düsseldorf
2018
Raja Ramanna Centre for Advanced Technology
2013-2016
Leibniz University Hannover
2009-2010
Tata Institute of Fundamental Research
1968-2008
University of Pisa
2007-2008
Indian Association for the Cultivation of Science
1970
We report on measurements of dynamical suppression interwell tunneling a Bose-Einstein condensate (BEC) in strongly driven optical lattice. The strong driving is sinusoidal shaking the lattice corresponding to time-varying linear potential, and measured by letting BEC freely expand rate reduced and, for certain values parameter, completely suppressed. Our results are excellent agreement with theoretical predictions. Furthermore, we have verified that, general, does not destroy phase...
We outline the experimental concept and key scientific capabilities of AION (Atom Interferometer Observatory Network), a proposed programme using cold strontium atoms to search for ultra-light dark matter, explore gravitational waves in mid-frequency range between peak sensitivities LISA LIGO/Virgo/ KAGRA/INDIGO/Einstein Telescope/Cosmic Explorer experiments, probe other frontiers fundamental physics. would complement planned searches as well mergers involving intermediate-mass black holes...
Albert Einstein's insight that it is impossible to distinguish a local experiment in "freely falling elevator" from one free space led the development of theory general relativity. The wave nature matter manifests itself striking way Bose-Einstein condensates, where millions atoms lose their identity and can be described by single macroscopic function. We combine these two topics report preparation observation condensate during fall 146-meter-tall evacuated drop tower. During expansion over...
We have observed tunneling suppression and photon-assisted of Bose-Einstein condensates in an optical lattice subjected to a constant force plus sinusoidal shaking. For sufficiently large force, the ground energy levels are shifted out resonance is suppressed; when shaking switched on, coupled by low-frequency photons resumes. Our results agree well with theoretical predictions demonstrate usefulness lattices for studying solid-state phenomena.
Alkaline-earth-metal atoms can exhibit long-range dipolar interactions, which are generated via the coherent exchange of photons on $^{3}P_{0}\ensuremath{-}^{3}D_{1}$ transition triplet manifold. In case bosonic strontium, we discuss here, this has a wavelength $2.6\text{ }\text{ }\ensuremath{\mu}\mathrm{m}$ and dipole moment 4.03 D, there exists magic permitting creation optical lattices that identical for states $^{3}P_{0}$ $^{3}D_{1}$. This interaction enables realization study mixtures...
Optical lattice clocks with uncertainty and instability in the $10^{-17}$-range below have so far been demonstrated exclusively using fermions. Here, we demonstrate a bosonic optical clock $3\times 10^{-18}$ $2.0\times 10^{-17}$ accuracy, both values improving on previous work by factor 30. This was enabled probing transition an ultra-long interrogation time of 4 s, long coherence provided cryogenic silicon resonator, careful stabilization relevant operating parameters, at low atom density....
Direct evidence of the interference effect in electron emission spectra from ionization molecular hydrogen collisions with bare C and F ions at relatively low collision energies is presented. Oscillations due to are deduced by comparing measured double differential cross sections electrons emitted those atomic hydrogen, rather than using calculated for H as a previous report. We believe these experimental data provide stronger support effect. show that it not only feature very high energy...
Abstract The increasing performance of optical lattice clocks has made them attractive for scientific applications in space and thus pushed the development their components including interrogation lasers clock transitions towards being suitable space, which amongst others requires making more power efficient, radiation hardened, smaller, lighter as well mechanically stable. Here we present a space-compatible laser system strontium constructed within Space Optical Clock (SOC2) project where...
Abstract This article contains a summary of the White Paper submitted in 2019 to ESA Voyage 2050 process, which was subsequently published EPJ Quantum Technology (AEDGE Collaboration et al. Quant. Technol. 7 ,6 2020). We propose this concept for space experiment using cold atoms search ultra-light dark matter, and detect gravitational waves frequency range between most sensitive ranges LISA terrestrial LIGO/Virgo/KAGRA/INDIGO experiments. interdisciplinary experiment, called Atomic...
This paper proposes a technique to synchronize networked radar in typical urban environment using low cost commercial-off-the-shelf (COTS) oscillators, augmented by signal processing. A method, termed Multiple Reference Phase Correction (MRPC), is presented that extracts oscillator phase from collection of reference targets simultaneously, including the direct line-ofsight and scattering large stationary objects. Significant improvement coherency bistatic via background measurements target...
The use of ultra-precise optical clocks in space ("master clocks") will allow for a range new applications the fields fundamental physics (tests Einstein's theory General Relativity, time and frequency metrology by means comparison distant terrestrial clocks), geophysics (mapping gravitational potential Earth), astronomy (providing local oscillators radio ranging interferometry space). Within ELIPS-3 program ESA, "Space Optical Clocks" (SOC) project aims to install operate an lattice clock...
We report the energy and angular distribution of electron double differential cross sections (DDCS) in collision $6\text{\ensuremath{-}}\mathrm{MeV}∕\mathrm{u}\phantom{\rule{0.3em}{0ex}}{\mathrm{C}}^{6+}$ ions with molecular hydrogen. explain observed distributions terms two-center effect Young-type interference effect. The secondary electrons having energies between 1 $1000\phantom{\rule{0.3em}{0ex}}\mathrm{eV}$ are detected at about 10 different emission angles...
In this paper, we present the theoretical as well experimental results on resonantly enhanced tunneling of Bose–Einstein condensates in optical lattices both linear case and for small nonlinearities. Our demonstrate usefulness simulating Hamiltonians originally used describing solid-state phenomena.
Precision timekeeping has been a driving force in innovation, from defining agricultural seasons to atomic clocks enabling satellite navigation, broadband communication and high-speed trading. We are on the verge of revolution timekeeping, where optical promise an over thousand-fold improvement stability accuracy. However, complex setups sensitivity thermal radiation pose limitations progress. Here we report atom source for strontium lattice clock which circumvents these limitations....
We report and characterize sub-kHz linewidth operation of an AlGaInP-based VECSEL system suitable for addressing the narrow cooling transition neutral strontium atoms at 689 nm. When frequency-stabilized to a standard air-spaced Fabry-Perot cavity (finesse 1000) via Pound-Drever-Hall (PDH) technique, it delivers output power >150 mW in circularly-symmetric single transverse mode with low frequency intensity noise. The optical field was reconstructed from noise error signal autocorrelation...
Momentum transfer and inelastic collision cross sections for electrons in CO, N2O CO2 have been calculated the energy range 0.01 to 0.1 eV. The effective-range theory Born approximation used calculate respectively elastic sections. scattering lengths found be approximately -1.12 a0, -3.7 a0 -7.2 respectively. rotational transition section CO at electron energies below vibrational threshold is very good agreement with experimental value. importance of quadrupole interaction other branches...
Abstract Recently, several reports with a strong focus on compact, nonstationary optical atomic clocks have been published, including accounts of in-field deployment these devices for demonstrations chronometric levelling in different types environments. We review recent progress this research area, comprising compact and transportable neutral atom single-ion clocks. The identified strive low volume, weight power consumption while exceeding standard microwave fractional frequency instability...
The ESA mission "Space Optical Clock" project aims at operating an optical lattice clock on the ISS in approximately 2023. scientific goals of are to perform tests fundamental physics, enable space-assisted relativistic geodesy and intercompare clocks ground using microwave links. performance goal space is less than $1 \times 10^{-17}$ uncertainty 10^{-15} {\tau}^{-1/2}$ instability. Within EU-FP7-funded project, a strontium demonstrator has been developed. Goal performances instability...
The UK National Quantum Technology Hub in Sensors and Metrology is one of four flagship initiatives the Program. As part a 20-year vision it translates laboratory demonstrations to deployable practical devices, with game-changing miniaturized components prototypes that transform state-of-the-art for quantum sensors metrology. It brings together experts from Universities Birmingham, Glasgow, Nottingham, Southampton, Strathclyde Sussex, NPL currently links over 15 leading international...