Recent Publications

  • Jing Li, Xi Chen, and A. Ruschhaupt, “Fast transport of Bose-Einstein condensate in anharmonic traps", Philosophical Transactions A (2022), in print. arXiv: 2210.03788
    We present a method to transport Bose–Einstein condensates (BECs) in anharmonic traps and in the presence of atom–atom interactions in short times without residual excitation. Using a combination of a variational approach and inverse engineering methods, we derive a set of Ermakov-like equations that take into account the coupling between the centre of mass motion and the breathing mode. By an appropriate inverse engineering strategy of those equations, we then design the trap trajectory to achieve the desired boundary conditions. Numerical examples for cubic or quartic anharmonicities are provided for fast and high-fidelity transport of BECs. Potential applications are atom interferometry and quantum information processing. 

  • Jing Li, E. Ya Sherman, and A. Ruschhaupt, “Quantum heat engine based on a spin-orbit- and Zeeman-coupled Bose-Einstein condensate”, Phys. Rev. A 106 (2022) L030201Arxiv: 2206.05041
    We explore the potential of a spin-orbit-coupled Bose-Einstein condensate for thermodynamic cycles. For this purpose we propose a quantum heat engine based on a condensate with spin-orbit and Zeeman coupling as a working medium. The cooling and heating are simulated by contacts of the condensate with an external magnetized media and demagnetized media. We examine the condensate ground-state energy and its dependence on the strength of the synthetic spin-orbit and Zeeman couplings and interatomic interaction. Then we study the efficiency of the proposed engine. The cycle has a critical value of spin-orbit coupling related to the engine’s maximum efficiency.

  • C. Whitty, A. Kiely and A. Ruschhaupt, "Improved anharmonic trap expansion through enhanced shortcuts to adiabaticity“, J. Phys. B: At. Mol. Opt. Phys. 55 (2022) 194003Arxiv: 2207.02288
    Shortcuts to adiabaticity (STA) have been successfully applied both theoretically and experimentally to a wide variety of quantum control tasks. In previous work the authors have developed an analytic extension to STA, called enhanced shortcuts to adiabaticity (eSTA), that extends STA methods to systems where STA cannot be applied directly (2020 Phys. Rev. Res. 2 023360). Here we generalize this approach and construct an alternative eSTA method that takes advantage of higher order terms. We apply this eSTA method to the expansion of both a Gaussian trap and accordion lattice potential, demonstrating the improved fidelity and robustness of eSTA. 

  • C. Whitty, A. Kiely and A. Ruschhaupt, "Robustness of enhanced shortcuts to adiabaticity in lattice transport“, Physical Review A 105 (2022) 013311Arxiv: 2109.04420
    Shortcuts to adiabaticity (STA) are a collection of quantum control techniques that achieve high fidelity outside of the adiabatic regime. Recently an extension to shortcuts to adiabaticity was proposed by the authors [Whitty, Kiely, and Ruschhaupt, Phys. Rev. Research 2, 023360 (2020)]. This method, enhanced shortcuts to adiabaticity (eSTA), provides an extension to the original STA control functions and allows effective control of systems not amenable to STA methods. It is conjectured that eSTA schemes also enjoy an improved stability over their STA counterparts. We provide numerical evidence of this claim by applying eSTA to fast atomic transport using an optical lattice and evaluating appropriate stability measures. We show that the eSTA schemes not only produce higher fidelities but also remain more stable against errors than the original STA schemes. 

  • I. Alonso et. al., “Cold Atoms in Space: Community Workshop Summary and Proposed Road-Map”, arXiv:2201.07789 (2022) 
    We summarize the discussions at a virtual Community Workshop on Cold Atoms in Space concerning the status of cold atom technologies, the prospective scientific and societal opportunities offered by their deployment in space, and the developments needed before cold atoms could be operated in space. The cold atom technologies discussed include atomic clocks, quantum gravimeters and accelerometers, and atom interferometers. Prospective applications include metrology, geodesy and measurement of terrestrial mass change due to, e.g., climate change, and fundamental science experiments such as tests of the equivalence principle, searches for dark matter, measurements of gravitational waves and tests of quantum mechanics. We review the current status of cold atom technologies and outline the requirements for their space qualification, including the development paths and the corresponding technical milestones, and identifying possible pathfinder missions to pave the way for missions to exploit the full potential of cold atoms in space. Finally, we present a first draft of a possible road-map for achieving these goals, that we propose for discussion by the interested cold atom, Earth Observation, fundamental physics and other prospective scientific user communities, together with ESA and national space and research funding agencies. 

Further Publications

  • A. Kiely, J. G. Muga and A. Ruschhaupt, "Effect of Poisson noise on adiabatic quantum control”, Physical Review A 95, 012115 (2017), ArXiv: 1609.04272

  • A. Kiely, A. Benseny, Th. Busch and A. Ruschhaupt, "Shaken, not stirred: Creating exotic angular momentum states by shaking an optical lattice", J. Phys. B 49 (2016) 215001

  • M. Palmero, S. Martinez-Garaot, U. G. Poschinger, A. Ruschhaupt and J. G. Muga, "Fast separation of two trapped ions“, New Journal of Physics 17, 093031 (2015)

  • S. Martínez-Garaot, A. Ruschhaupt, J. Gillet, Th. Busch and J. G. Muga, "Fast quasiadiabatic dynamics“, Physical Review A 92, 043406 (2015)

  • M. Ndong,G. Djotyan, A. Ruschhaupt and S. Guerin, "Robust coherent superposition of states by single-shot shaped pulse“, Journal of Physics B  48, 174007 (2015)

  • X.-J. Lu, M. Palmero, A. Ruschhaupt, Xi Chen and J. G. Muga, "Optimal transport of two ions under slow spring-constant drifts“, Physica Scripta 90, 074038 (2015)

  • A. Kiely, J. P. L. McGuinness, J. G. Muga and A. Ruschhaupt, "Fast and stable manipulation of a charged particle in a Penning trap“, Journal of Physics B 48, 07550 (2015)

  • X-L Lu, J.G. Muga, X. Chen, U. G. Poschinger, F. Schmidt-Kaler and A. Ruschhaupt, "Fast shuttling of a trapped ion in the presence of noise“, Physical Review A 89, 063414 (2014)

  • A. Kiely and A. Ruschhaupt, "Inhibiting unwanted transitions in population transfer in two- and three-level quantum systems“, Journal of Physics B 47, 115501 (2014)

  • E. Torrontegui, S. Ibánez, S. Martínez-Garaot, M. Modugno, A. del Campo, D. Guéry-Odelin, A. Ruschhaupt, X. Chen and J. G. Muga, "Shortcuts to Adiabaticity“, Advances In Atomic, Molecular, And Optical Physics, 62, 117 (2013), ArXiv: 1212.6343  (more than 360 citations)

  • D. Daems, A, Ruschhaupt, D. Sugny and S. Guérin, "Robust Quantum Control by a Single-Shot Shaped Pulse“, Physical Review Letters 111, 050404 (2013), ArXiv: 1304.4016 (more than 80 citations)
  • A. Ruschhaupt and J.G. Muga, "Shortcuts to adiabaticity in two-level systems: control and optimization“, Journal of Modern Optics DOI:10.1080/09500340.2013.846431 (2013)

  • X-L Lu, X. Chen, A. Ruschhaupt, D. Alonso, S. Guérin and J.G. Muga, "Fast and robust population transfer in two-level quantum systems with dephasing noise and/or systematic frequency errors“, Physical Review A 88 , 033406 (2013)

  • J. Kiukas, A. Ruschhaupt and R.F. Werner, "Full counting statistics of stationary particle beams“, Journal of Mathematical Physics 54, 042109 (2013)

  • A. Ruschhaupt, X. Chen, D. Alonso and J.G. Muga, "Optimally robust shortcuts to population inversion in two-level quantum systems“, New Journal of Physics 14, 093040 (2012), ArXiv: 1206.1691 (more than 150 citations)

  • S. Ibánez, X. Chen,  E. Torrontegui, J. G. Muga and A. Ruschhaupt, "Multiple Schrödinger Pictures and Dynamics in Shortcuts to Adiabaticity“, Physical Review Letters 109, 100403 (2012), ArXiv: 1112.5522 (more than 115 citations)

  • V.P. Singh and A. Ruschhaupt, "Optimizing the catching of atoms or molecules in two-dimensional traps“, Physical Review A 86, 043834 (2012)

  • E. Torrontegui, S. Martinez-Garaot, A. Ruschhaupt, and J. G. Muga, "Shortcuts to adiabaticity: Fast-forward approach“, Physical Review A 86, 013601 (2012)

  • J. Kiukas, A. Ruschhaupt, P. O. Schmidt and R. F. Werner, "Exact Energy-Time Uncertainty Relation for Arrival Time by Absorption“, Journal of Physics A 45, 185301 (2012)

  • W. Schmunk, M. Gramegna, G. Brida, I. P. Degiovanni, M. Genovese, H. Hofer, S. Kück, L. Lolli, M. G. A. Paris, S. Peters, M. Rajteri, A. M. Racu, A. Ruschhaupt, E. Taralli and P. Traina, "Photon Number Statistics of NV Centre Emission“, Metrologia 49, S156 (2012)
  • E. Torrontegui, X. Chen, M. Modugno, S. Schmidt, A. Ruschhaupt , D. Guéry-Odelin and J. G. Muga, "Transitionless expansion of cold atoms in optical Gaussian beam traps“, Physical Review A 85, 033605 (2012)

  • E. Torrontegui, X. Chen, M. Modugno, S. Schmidt, A. Ruschhaupt and J. G. Muga, "Fast transport of Bose-Einstein condensates“, New Journal of Physics, 14, 013031 (2012)

  • E. Torrontegui, S. Ibáñez, X. Chen, A. Ruschhaupt, D. Guéry-Odelin and J. G. Muga, "Fast atomic transport without vibrational heating“, Physical Review A 83, 013415 (2011) (more than 125 citations)

  • E. Torrontegui, A. Ruschhaupt, D. Guéry-Odelin and J. G. Muga, "Simulation of quantum collinear chemical reactions with ultracold atoms“, Journal of Physics B: At. Mol. Opt. Phys. 44, 195302 (2011)

  • J. G. Muga, X. Chen, E. Torrontegui, S. Ibáñez, I. Lizuain and A. Ruschhaupt, "Shortcuts to quantum adiabatic processes“, Journal of Physics: Conference Series 306, 012022 (2011)

  • I. Lizuain, J. Echanobe, A. Ruschhaupt, J. G. Muga and D. A. Steck, "Structural and dynamical aspects of avoided-crossing resonances in a 3-level Λ system“, Physical Review A 82, 065602 (2010)

  • E. Torrontegui, J. Echanobe, A. Ruschhaupt, D. Guéry-Odelin and J. G. Muga, "Cold-atom dynamics in crossed-laser-beam waveguides“, Physical Review A 82, 043420 (2010)

  • E. Ya. Sherman, J. G. Muga, V. K. Dugaev and A. Ruschhaupt, "Strong electron spin-Hall effect by a coherent optical potential“, Semiconductor Science and Technology 25, 0905004 (2010)

  • J. G. Muga, X. Chen, S. Ibáñez, I. Lizuain and A. Ruschhaupt, "Transitionless quantum drivings for the harmonic oscillator“, Journal of Physics B 43, 085509 (2010)

  • X. Chen, A. Ruschhaupt, S. Schmidt, S. Ibáñez and J. G. Muga, "Review: Shortcut to adiabaticitiy in harmonic traps“, Journal of Atomic and Molecular Sciences 1, 1 (2010)

  • X. Chen, I. Lizuain, A. Ruschhaupt, D. Guéry-Odelin and J. G. Muga, "Shortcut to Adiabatic Passage in Two- and Three-Level Atoms“, Physical Review Letters 105, 123003 (2010) (more than 260 citations)

  • X. Chen, A. Ruschhaupt, S. Schmidt, A. del Campo,   D. Guéry-Odelin and J. G. Muga, "Fast Optimal Frictionless Atom Cooling in Harmonic Traps: Shortcut to Adiabaticity“, Physical Review Letters 104, 063002 (2010) (more than 285 citations)

  • J. G. Muga, Xi Chen, A. Ruschhaupt and D. Guéry-Odelin, "Frictionless dynamics of Bose-Einstein condensates under fast trap variations“, Journal of Physics B: At. Mol. Opt. Phys. 42, 241001 (2009) (more than 100 citations)

  • Xi Chen, J. G. Muga, A. del Campo and A. Ruschhaupt, "Atom cooling by nonadiabatic expansion“, Physical Review A 80, 063421 (2009)

  • S. Schmidt, J. G. Muga and A. Ruschhaupt, "Stopping particles of arbitrary velocities with an accelerated wall“, Physical Review A 80, 023406 (2009)

  • J. Kiukas, A. Ruschhaupt and R. F. Werner, "Tunneling Times with Covariant Measurements”, Foundation of Physics 39, 829-846 (2009)

  • A. Ruschhaupt, A. del Campo and J. G. Muga, "Momentum-space interferometry with trapped ultracold atoms“, Physical Review A 79, 023616 (2009)

  • A. Ruschhaupt and J. G. Muga, "Control of atomic motion with an atom-optical diode on a ring“, Journal of Physics B: At. Mol. Opt. Phys. 41, 205503 (2008)

  • A. Ruschhaupt and J. G. Muga, "The atom diode - A one-way laser barrier for cooling atoms“, European Physical Journal Special Topics 159, 127–134 (2008)

  • A. Ruschhaupt and J. G. Muga, "Three-dimensional effects in atom diodes: Atom-optical devices for one-way motion“, Physical Review A 76, 013619 (2007)

  • A. Ruschhaupt, A. del Campo and J. G. Muga, "Momentum interferences of a freely expanding Bose-Einstein condensate due to interatomic interaction change“, European Physical Journal D 40, 399-403 (2006)

  • F. Delgado, J. G. Muga and A. Ruschhaupt, "Preparation of ultralow atomic velocities by transforming bound states into tunneling resonances“, Physical Review A 74, 063618 (2006)

  • I. Lizuain, J. G. Muga and A. Ruschhaupt, "Laser excitation of transverse modes in an atomic waveguide“, Physical Review A 74, 053608 (2006)

  • A. Ruschhaupt, J. G. Muga and M. G. Raizen, "One-photon atomic cooling with an optical Maxwell's demon valve“, Journal of Physics B 39, 3833 (2006)

  • A. Ruschhaupt, J. G. Muga and M. G. Raizen, "Improvement by laser quenching of an `atom diode': a one-way barrier for ultra-cold atoms“, Journal of Physics B 39, L133-L138 (2006)

  • A. Ruschhaupt and J. G. Muga, "Adiabatic interpretation of a two-level atom diode, a laser device for unidirectional transmission of ground-state atoms“, Physical Review A 73, 013608 (2006)

  • A. Ruschhaupt, F. Delgado and J. G. Muga, "Physical realization of PT-symmetric potential scattering in a planar slab waveguide“, Journal of Physics A 38, L171-L176 (2005)

  • A. Ruschhaupt, F. Delgado and J. G. Muga, "Velocity selection of ultra-cold atoms with Fabry-Perot laser devices: improvements and limits“, Journal of Physics B 38, 2665-2674 (2005)

  • Ph. Blanchard, T. Krueger and A. Ruschhaupt, "Small world graphs by iterated local edge formation“, Physical Review E 71, 046139 (2005)

  • A. Ruschhaupt and J. G. Muga, "Atom diode: a laser device for a unidirectional transmission of ground-state atoms“, Physical Review A 70, 061604(R) (2004), ArXiv: quant-ph/0408133 (more than 62 citations)

  • Ruschhaupt and J. G. Muga, "Simultaneous Arrival of Information in Absorbing Waveguides“, Physical Review Letters 93, 020403 (2004)ArXiv: quant-ph/0402186

  • A. Ruschhaupt, B. Navarro and J. G. Muga, "Perfect detection of ultra-cold atoms by laser-induced ionization“, Journal of Physics B 37, L313-319 (2004)

  • A. Ruschhaupt, J. A. Damborenea, B. Navarro, J. G. Muga and G. C. Hegerfeldt, "Exact and approximate complex potentials for modelling time observables“, Europhysics Letters 67, 1-7 (2004)

  • F. Delgado, J. G. Muga and A. Ruschhaupt, "Ultrafast propagation of Schrödinger waves in absorbing media“, Physical Review A 69, 022106 (2004)

  • F. Delgado, J. G. Muga, A. Ruschhaupt, G. Garcia-Calderon and J. Villavicencio, "Tunneling dynamics in relativistic and nonrelativistic wave equations“, Physical Review A 68, 032101 (2003)

  • I. L. Egusquiza, J. G. Muga, B. Navarro and A. Ruschhaupt, "Comment on: On the standard quantum-mechanical approach to times of arrival“, Physics Letters A 313, 498-501 (2003)

  • A. Ruschhaupt, "Relativistic time of arrival and traversal time“, Journal of Physics A 35, 10429-10443 (2002)

  • A. Ruschhaupt, "A relativistic extension of event enhanced quantum theory“, Journal of Physics A 35, 9227-9243 (2002)

  • Ph. Blanchard, A. Jadczyk and A. Ruschhaupt, "How events come into being: EEQT, particle tracks, quantum chaos and tunnelling time“, Journal of Modern Optics 47, 2247-2263 (2000)

  • A. Ruschhaupt, "Simulations of barrier traversal and reflection times based on event enhanced quantum theory“, Physics Letters A 250, 249-256 (1998)

Scientific Book

  • "Time in Quantum Mechanics - Vol. 2“
    Lecture Notes in Physics, Vol. 789 (Springer, 2009)
    J. G. Muga, A. Ruschhaupt and A. del Campo (Editors)

Book Chapters

  • A. Ruschhaupt and R. F. Werner, "Quantum Mechanics of Time“ in "The Message of Quantum Science” (Ph. Blanchard, J. Fröhlich, Editoren, Springer, 2015)

  • A. Ruschhaupt, J. G. Muga and G. C. Hegerfeldt, "Detector models for the quantum time of arrival“, in "Time in Quantum Mechanics - Vol. 2“ (Lecture Notes in Physics, Vol. 789, 2009), J. G. Muga, A. Ruschhaupt and A. del Campo (Editoren)

  • A. Ruschhaupt, "An Application of EEQT: Tunneling Times“ in Ph. Blanchard et. al. (Editoren) "Decoherence: Theoretical, Experimental, and Conceptual Problems“ (LNP 538, Springer, 2000)

Quantum Control via Shortcuts to Adiabaticity

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