Quantum Control group

Books Introduction to the Physics of Waves    ISBN 9780521147163 (paperback)    ISBN 9780521197571 (hardback)    Cambridge University Press (2012)      http://www.cambridge.org/waves

Publications

Reprints are in many cases available by following the links given; otherwise, please contact us for a copy.

articles in preparation

• Quantum technologies for classical navigators
     Max Carey and Tim Freegarde
• Classical theory of mirror-mediated cooling
     André Xuereb, James Bateman and Tim Freegarde
• Compensation of phase modulation nonlinearities in Raman atom interferometry
     Max Carey, Jack Saywell, Nikolaos Dedes, Joel Abraham and Tim Freegarde
• Ramsey phase tomography of optimized Raman pulses for atom interferometry
     Max Carey, Jack Saywell, Nikolaos Dedes, Joel Abraham and Tim Freegarde

2025

• Temporal pulse origins in atom interferometric quantum sensors
     Jack Saywell, Nikolaos Dedes, Max Carey, Brynle Barrett and Tim Freegarde, arXiv:2510.01900

2024

• Real-time scale-factor calibration for cold-atom gyroscope based on point-source interferometry
     Nikolaos Dedes, David Harvey and Tim Freegarde, IEEE Int Symp on Inertial Sensors & Systems (INERTIAL)(2024)

2023

• Optimizing beam-splitter pulses for atom interferometry: A geometric approach
     Nikolaos Dedes, Jack Saywell, Max Carey, Ilya Kuprov and Tim Freegarde, Phys Rev A 108 053319 (2023)

2022

• Efficient state-symmetric beamsplitters and mirrors for atom interferometers using optimized pulses
     J Saywell, M Carey, N Dedes, I Kuprov and T Freegarde, J Phys B 55 205501 (2022)

2021

• Can optimised pulses improve the sensitivity of atom interferometers?
     J Saywell, M Carey, N Dedes, I Kuprov and T Freegarde, Proc SPIE 11881 83--92 (2021)   

2020

• Loading and cooling in an optical trap via hyperfine dark states
     D S Naik, H Eneriz-Imaz, M Carey, T Freegarde, F Minardi, B Battelier, P Bouyer and A Bertoldi, Phys Rev Research 2 (1), 013212 (2020)   
• Optimal control of Raman pulse sequences for atom interferometry
     Jack Saywell, Max Carey, Mohammad Belal, Ilya Kuprov and Tim Freegarde, J Phys B 53 (8) 085006 (2020)   
• Bi-selective pulses for large-area atom interferometry
     Jack Saywell, Max Carey, Ilya Kuprov and Tim Freegarde, Phys Rev A 101 063625 (2020)   

2019

• Velocimetry of cold atoms by matterwave interferometry
     Max Carey, Jack Saywell, Mohammad Belal and Tim Freegarde, Phys Rev A 99 023631 (2019)   

2018

• Optimal control of mirror pulses for cold-atom interferometry
     Jack C Saywell, Ilya Kuprov, David Goodwin, Max Carey and Tim Freegarde Phys Rev A 98 023625 (2018)   
• Matterwave interferometric velocimetry of cold Rb atoms
     Max Carey, Mohammad Belal, Matthew Himsworth, James Bateman and Tim Freegarde, J Mod Opt 65 (5-6), 657-666 (2018)   

2016

• Spectroscopic apparatus for measuring an amount of an analyte in a mixture using a frequency-modulated laser beam
     Ned Hawes and Tim Freegarde, UK Patent https://www.ipo.gov.uk/p-ipsum/Case/PublicationNumber/GB2536187   
• Non-trivial phase coupling in polariton multiplets
     Hamid Ohadi, Rachel Gregory, Tim Freegarde, Yuri Rubo, Alexey Kavokin, Natalia Berloff and Pavlos Lagoudakis, Phys. Rev. X 6, 031032 (2016)   
• The UK National Quantum Technology Hub in Sensors and Metrology
     K. Bongs et al., Proc. SPIE 9900, 990009 (2016)   

2015

• Interferometric laser cooling of atomic rubidium
     Alex Dunning, Rachel Gregory, James Bateman, Matt Himsworth and Tim Freegarde, Phys. Rev. Lett. 115, 073004 (2015)   

2014

• Composite pulses for interferometry in a thermal cold atom cloud
     Alex Dunning, Rachel Gregory, James Bateman, Nathan Cooper, Matt Himsworth, Tim Freegarde and Jonathan Jones, Phys Rev A 90, 033608 (2014)   

2013

• Trapping of ⁸⁵Rb atoms by optical pumping between metastable hyperfine states
     Nathan Cooper and Tim Freegarde, J. Phys. B 46, 215003 (2013)   
• A stabilized fiber-optic Mach-Zehnder interferometer for carrier-frequency rejection
     Nathan Cooper, Jonathan Woods, James Bateman, Alexander Dunning and Tim Freegarde, Appl Opt 52, 5713 (2013)   

2012

• Mirror-mediated cooling: a paradigm for particle cooling via the retarded dipole force
     Peter Horak, André Xuereb and Tim Freegarde, Annual Review of Cold Atoms & Molecules 1, 353-378 (2013) (http://arxiv.org/abs/0904.3059)
• Actively stabilized wavelength-insensitive carrier elimination from an electro-optically modulated laser beam
     Nathan Cooper, James Bateman, Alexander Dunning and Tim Freegarde, J Opt Soc Am B 29 646 (2012)   

2011

• Amplified optomechanics in a unidirectional ring cavity
     André Xuereb, Peter Horak and Tim Freegarde, J Mod Opt 58 1342 (2011)   
• Efficient optomechanical cooling in one-dimensional interferometers
     Péter Domokos, André Xuereb, Tim Freegarde and Peter Horak, Proc SPIE 7951 79510B (2011)   
• Cavity cooling of atoms: within and without a cavity
     André Xuereb, Péter Domokos, Peter Horak and Tim Freegarde, Eur Phys J D 65 273 (2011)   

2010

• Hänsch-Couillaud locking of Mach-Zehnder interferometer for carrier removal from a phase-modulated optical spectrum
     James Bateman, Rich Murray, Matt Himsworth, Hamid Ohadi, André Xuereb and Tim Freegarde, J Opt Soc Am B 27 1530 (2010)   
• Opto-mechanical cooling with generalized interferometers
     André Xuereb, Tim Freegarde, Peter Horak and Péter Domokos, Phys Rev Lett 105 013602 (2010)   
• Rubidium pump-probe spectroscopy: comparison between ab-initio theory and experiment
     Matt Himsworth and Tim Freegarde, Phys Rev A 81 023423 (2010)   
• Optical cooling of atoms in microtraps by time-delayed reflection
     Peter Horak, André Xuereb and Tim Freegarde, J Comput Theor Nanosci 7 1747 (2010) (http://arxiv.org/abs/0911.4805)
• Scattering theory of multilevel atoms interacting with arbitrary radiation fields
     André Xuereb, Péter Domokos, Peter Horak, and Tim Freegarde, Physica Scripta T140 014010 (2010)   
• Stimulated Raman transitions via multiple atomic levels
     James Bateman, André Xuereb and Tim Freegarde, Phys Rev A 81 043808 (2010)   

2009

• Magneto-optical trapping and background-free imaging for atoms near nanostructured surfaces
     Hamid Ohadi, Matt Himsworth, André Xuereb and Tim Freegarde, Opt. Express 17 23003 (2009)   
• Atom cooling using the dipole force of a single retroreflected laser beam
     André Xuereb, Peter Horak and Tim Freegarde, Phys Rev A 80 013836 (2009)   
• Scattering theory of cooling and heating in optomechanical systems
    André Xuereb, Péter Domokos, János Asbóth, Peter Horak and Tim Freegarde, Phys Rev A 79 053810 (2009)   
      synopses in APS Physics (May 2009) and Nature Photonics (2009)

2007

• Fractional Adiabatic Passage in two-level systems: mirrors and beam-splitters for atomic interferometry
    James Bateman, Tim Freegarde, Phys Rev A 76 013416 (2007)   

2006

• Coherent amplification in laser cooling and trapping
    Tim Freegarde, Geoff Daniell, Danny Segal, Phys Rev A 73 033409 (2006)   
• Atom guiding along high order Laguerre-Gaussian light beams formed by spatial light modulation
    D. P. Rhodes, D. M. Gherardi, J. Livesey, D. McGloin, H. Melville, T. Freegarde, K. Dholakia, J Mod Opt 53 547-56 (2006)   

2003

• 'Algorithmic cooling' in a momentum state quantum computer
    Tim Freegarde, Danny Segal, Phys Rev Lett 91 037904 (2003)   
• Tailoring cavity-enhanced light fields for cold atom manipulation
    Tim Freegarde, Kishan Dholakia, in Interactions in Ultracold Gases (Wiley-VCH)

2002

• Cavity-enhanced optical bottle beam as a mechanical amplifier
    Tim Freegarde, Kishan Dholakia, Phys Rev A 66 013413 (2002)   
• Cavity-enhanced toroidal dipole force traps for dark-field seeking species
    Tim Freegarde, Kishan Dholakia, Opt Commun 201 99-104 (2002)   

2001

• On the design of enhancement cavities for second harmonic generation
    Tim Freegarde, Claus Zimmermann, Opt Commun 199 435-446 (2001)   
• The design of enhancement cavities for second harmonic generation
    Tim Freegarde, Claus Zimmermann, in Laser Physics at the Limits (Springer-Verlag)
• C-N bond formation in the reaction of nitrogen ions N⁺ with benzene molecules
    D Ascenzi et al, Chem Phys Lett 346 35-40 (2001)   
• A simple interlocked controller for research vacuum systems
    Tim Freegarde, Jim Jessup, Gus Hancock, Meas Sci Technol 12 N43-46 (2001)   

1995 - 2000

• OH detection by absorption of frequency doubled diode laser radiation at 308 nm
    Hugh Barry et al, Chem Phys Lett 319 125-130 (2000)   
• General analysis of type-I second harmonic generation with elliptical Gaussian beams
    Tim Freegarde et al, J Opt Soc Am B 14 2010-2016 (1997)   
• A guide to laser-induced fluorescence diagnostics in plasmas
    Tim Freegarde, Gus Hancock, J de Physique IV France 7 C4/15-29 (1997)   
• Doppler spectroscopic measurements of sheath ion velocities in radiofrequency plasmas
    Ben Woodcock et al, J Appl Phys 81 5945-5949 (1997)   
• Phase locking of grating tuned diode lasers
    M Prevedelli, T G M Freegarde, T W Hänsch, Appl Phys B 60 S241-248 (1995)   
• Confinement and manipulation of atoms using short laser pulses
    T G M Freegarde, J Walz, T W Hänsch, Opt Commun 117 262-267 (1995)   

PhD theses

• Error and performance analysis of cold-atom inertial sensors for navigation
    Nikolaos Dedes, (2024) (pdf - 10MB)
• Progress towards atom interferometric measurements of gravity in a compact and integrated vacuum chamber
    Chester Camm, (2020) (pdf - 8MB)
• Optimal control of cold atoms for ultra-precise quantum sensors
    Jack Saywell, (2020) (pdf - 8MB)
• Velocimetry, trapping and optimal coherent manipulation of atomic rubidium
    Max Carey, (2020) (pdf - 13MB)
• Towards fabrication of optomechanical actuators by two-photon polymerisation
    Alan Forrester, (2017) (pdf - 12MB)
• A mode-locked diode laser frequency comb for ultracold atomic physics experiments
    Jonathan Woods, (2016) (pdf - 28MB)
• Phase and intensity control of lasers for atom interferometry
    Rachel Gregory, (2015) (pdf - 22MB)
• Novel techniques for the trapping and manipulation of ultracold atoms
    Nathan Cooper, (2014) (pdf - 65MB)
• Coherent atomic manipulation and cooling using composite optical pulse sequences
    Alex Dunning, (2014) (pdf - 8MB)
• Coherent two-photon excitation within an extended cloud of Rubidium 85 for the purposes of atomic interferometry and cooling
    Richard Murray, (2011) (pdf - 17MB)
• Optical cooling using the dipole force
    André Xuereb, (2011) (pdf - 10MB)
• Coherent manipulation of ultracold rubidium
    Matt Himsworth, (2009) (pdf - 7MB)
• Novel schemes for the optical manipulation of atoms and molecules
    James Bateman (2009) (pdf - 51MB)
• A chirped, pulsed laser system and magneto-optical trap for rubidium
    Sunil Patel, (2009) (pdf - 53MB)
• Spectroscopic applications of pulsed metal vapour lasers
    Tim Freegarde, (1989) (pdf - 53MB)

For details of conference presentations, please see our poster and talks pages.