Publications (24)
Cavity cooling of atoms: Within and without a cavity
André Xuereb, Peter Domokos, Peter Horak +1
We compare the efficiencies of two optical cooling schemes, where a single particle is either inside or outside an optical cavity, under experimentally-realisable conditions. We ev…
Terrestrial Very-Long-Baseline Atom Interferometry: Summary of the Second Workshop
Adam Abdalla, Mahiro Abe, Sven Abend +307
This summary of the second Terrestrial Very-Long-Baseline Atom Interferometry (TVLBAI) Workshop provides a comprehensive overview of our meeting held in London in April 2024, build…
Amplified optomechanics in a unidirectional ring cavity
André Xuereb, Peter Horak, Tim Freegarde
We investigate optomechanical forces on a nearly lossless scatterer, such as an atom pumped far off-resonance or amicromirror, inside an optical ring cavity. Our model introduces t…
Optimized Raman pulses for atom interferometry
Jack Saywell, Max Carey, Mohammad Belal +2
We present mirror and beamsplitter pulse designs that improve the fidelity of atom interferometry and increase its tolerance of systematic inhomogeneities. These designs are demons…
Velocimetry of cold atoms by matterwave interferometry
Max Carey, Jack Saywell, David Elcock +2
We present an elegant application of matterwave interferometry to the velocimetry of cold atoms whereby, in analogy to Fourier transform spectroscopy, the 1-D velocity distribution…
Matterwave interferometric velocimetry of cold Rb atoms
Max Carey, Mohammad Belal, Matthew Himsworth +2
We consider the matterwave interferometric measurement of atomic velocities, which forms a building block for all matterwave inertial measurements. A theoretical analysis, addressi…
Optimal control of mirror pulses for atom interferometry
Jack Saywell, Ilya Kuprov, David Goodwin +2
Atom matterwave interferometry requires mirror and beamsplitter pulses that are robust to inhomogeneities in field intensity, magnetic environment, atom velocity and Zeeman sub-sta…
'Algorithmic cooling' in a momentum state quantum computer
Tim Freegarde, Danny Segal
We describe a quantum computer based upon the coherent manipulation of two-level atoms between discrete one-dimensional momentum states. Combinations of short laser pulses with kin…
Bi-selective pulses for large-area atom interferometry
Jack Saywell, Max Carey, Ilya Kuprov +1
We present designs for the augmentation 'mirror' pulses of large-momentum-transfer atom interferometers that maintain their fidelity as the wavepacket momentum difference is increa…
Scattering theory of cooling and heating in opto-mechanical systems
André Xuereb, Peter Domokos, János Asbóth +2
We present a one-dimensional scattering theory which enables us to describe a wealth of effects arising from the coupling of the motional degree of freedom of scatterers to the ele…
Magneto-optical trapping and background-free imaging for atoms near nanostructured surfaces
Hamid Ohadi, Matthew Himsworth, André Xuereb +1
We demonstrate a combined magneto-optical trap and imaging system that is suitable for the investigation of cold atoms near surfaces. In particular, we are able to trap atoms close…
Mirror-mediated cooling: a paradigm for particle cooling via the retarded dipole force
Tim Freegarde, James Bateman, André Xuereb +1
Cooling forces result from the retarded dipole interaction between an illuminated particle and its reflection. For a one-dimensional example, we find cooling times of milliseconds…
Interferometric laser cooling of atomic rubidium
Alexander Dunning, Rachel Gregory, James Bateman +2
We report the 1-D cooling of Rb atoms using a velocity-dependent optical force based upon Ramsey matter-wave interferometry. Using stimulated Raman transitions between groun…
Atom cooling using the dipole force of a single retroreflected laser beam
André Xuereb, Peter Horak, Tim Freegarde
We present a mechanism for cooling atoms by a laser beam reflected from a single mirror. The cooling relies on the dipole force and thus in principle applies to arbitrary refractiv…
Stimulated Raman transitions via multiple atomic levels
James Bateman, André Xuereb, Tim Freegarde
We consider the stimulated Raman transition between two long-lived states via multiple intermediate states, such as between hyperfine ground states in the alkali-metal atoms. We pr…
Optomechanical cooling with generalized interferometers
André Xuereb, Tim Freegarde, Peter Horak +1
The fields in multiple-pass interferometers, such as the Fabry--Pérot cavity, exhibit great sensitivity not only to the presence but also to the motion of any scattering object wi…
Trapping of 85Rb atoms by optical pumping between metastable hyperfine states
Nathan Cooper, Tim Freegarde
We describe an atom trapping mechanism based upon differential optical pumping between metastable hyperfine states by partially-displaced laser beams in the absence of a magnetic f…
Temporal Pulse Origins in Atom Interferometric Quantum Sensors
Jack Saywell, Nikolaos Dedes, Max Carey +2
Quantum sensors based upon atom interferometry typically rely on radio-frequency or optical pulses to coherently manipulate atomic states and make precise measurements of inertial…
Optimizing beam-splitter pulses for atom interferometry: a geometric approach
Nikolaos Dedes, Jack Saywell, Max Carey +2
We present a methodology for the design of optimal Raman beam-splitter pulses suitable for cold atom inertial sensors. The methodology, based on time-dependent perturbation theory,…
Actively stabilized wavelength-insensitive carrier elimination from an electro-optically modulated laser beam
Nathan Cooper, James Bateman, Alexander Dunning +1
We demonstrate a simple and robust technique for removal of the carrier wave from a phase-modulated laser beam, using a non-interferometric method that is insensitive to the modula…
Composite pulses for interferometry in a thermal cold atom cloud
Alexander Dunning, Rachel Gregory, James Bateman +4
Atom interferometric sensors and quantum information processors must maintain coherence while the evolving quantum wavefunction is split, transformed and recombined, but suffer fro…
Stabilized fiber-optic Mach-Zehnder interferometer for carrier-frequency rejection
Nathan Cooper, Jonathan Woods, James Bateman +2
We have demonstrated stabilization of a fiber-optic Mach-Zehnder interferometer, with a centimeter-scale path difference, to the transmission minimum for the carrier wave of a freq…
Optical cooling of atoms in microtraps by time-delayed reflection
Peter Horak, André Xuereb, Tim Freegarde
We present a theoretical analysis of a novel scheme for optical cooling of particles that does not in principle require a closed optical transition. A tightly confined laser beam i…
Scattering theory of multilevel atoms interacting with arbitrary radiation fields
André Xuereb, Peter Domokos, Peter Horak +1
We present a generic transfer matrix approach for the description of the interaction of atoms possessing multiple ground state and excited state sublevels with light fields. This m…