Publications
Recent Publications
 Manuel Odelli, Andreas Ruschhaupt, Vladimir M. Stojanovic, "Enhanced twistandturn dynamics of spin squeezing in internal bosonic Josephson junctions", arXiv:2404.19685
The twistandturn dynamics of spin squeezing results from the interplay of the (nonlinear) oneaxistwisting and the (linear) transversefield turning term in the underlying Hamiltonian, both with constant (timeindependent) respective coupling strengths. Using the methods of shortcuts to adiabaticity (STA) and their recently proposed enhanced version (eSTA), we demonstrate here that dynamics of this type can be utilized for a fast and robust preparation of spinsqueezed states in internal bosonic Josephson junctions  condensates of cold bosonic atoms in two different internal (hyperfine) states (singleboson modes).
Assuming that the initial state of this system is the coherent spin state with all the bosons in the equal superposition of the two singleboson modes and that the nonlinearcoupling strength in this system remains constant, we set out to determine the timedependence of the linearcoupling strength using the STA and eSTA approaches. We then quantitatively characterize the modified twistandturn dynamics in this system by evaluating the coherent spinsqueezing and numbersqueezing parameters, as well as the fidelity of the target spinsqueezed states.
In this manner, we show that the eSTA approach allows for a particularly robust experimental realization of strongly spinsqueezed states in this system, consistently outperforming its adiabatic and STAbased counterparts, even for systems with several hundred particles.  Muhammad S. Hasan, Thomás Fogarty, Jing Li, Andreas Ruschhaupt, Thomas Busch, "High fidelity control of a manybody TonksGirardeau gas with an effective meanfield approach", Physical Review Research 6, 023114 (2024); ArXiv:2402.00349
Shortcuts to adiabaticity (STA) are powerful tools that can be used to control quantum systems with high fi delity. They work particularly well for single particle and noninteracting systems which can be described exactly and which possess invariant or selfsimilar dynamics. However, finding an exact STA for strongly correlated manybody systems can be difficult, as their complex dynamics may not be easily described, especially for larger systems that do not possess selfsimilar solutions. Here, we design STAs for onedimensional bosonic gas in the TonksGirardeau limit by using a meanfield approach that succinctly captures the strong interaction effects through a quintic nonlinear term in the Schrödinger equation. We show that for the case of the harmonic oscillator with a timedependent trap frequency the meanfield approach works exactly and recovers the wellknown STA from literature. To highlight the robustness of our approach we also show that it works effectively for anharmonic potentials, achieving higher fidelities than other typical control techniques.  Jing Li, E. Ya. Sherman, Andreas Ruschhaupt, "Quantum control of classical motion: piston dynamics in a Rabicoupled BoseEinstein condensate", arXiv: 2310.08675
We explore the dynamics of a hybrid classicalquantum system consisting of a classical piston and a selfinteracting pseudospin 1/2 BoseEinstein condensate with a timedependent Rabi coupling. We investigate the mechanical work produced by the piston moving as a result of the quantum pressure of the condensate. The timedependent Rabi field redistributes the condensate density between the spin components and, as a result, causes a time dependent pressure acting on the piston. Correspondingly, the motion of the piston produces quantum evolution of the condensate mass and spin density profiles. We show how by optimised design of the timedependent direction of the Rabi field, one can control position and velocity of the piston.  Manuel Odelli, Vladimir M. Stojanovic, Andreas Ruschhaupt, "Spin squeezing in internal bosonic Josephson junctions via enhanced shortcuts to adiabaticity", Physical Review Applied 50, 054038 (2023); ArXiv: 2305.20032
We investigate a timeefficient and robust preparation of spinsqueezed states  a class of states of interest for quantumenhanced metrologyin internal bosonic Josephson junctions with a timedependent nonlinear coupling strength between atoms in two different hyperfine states. We treat this statepreparation problem, which had previously been addressed using shortcuts to adiabaticity (STA), using the recently proposed analytical modification of this class of quantumcontrol protocols that became known as the enhanced STA (eSTA) method. We characterize the statepreparation process by evaluating the time dependence of the coherent spinsqueezing and numbersqueezing parameters and the targetstate fidelity. We show that the statepreparation times obtained using the eSTA method compare favourably to those found in previously proposed approaches. We also demonstrate that the increased robustness of the eSTA approach  compared to its STA counterpart  leads to additional advantages for potential experimental realizations of strongly spinsqueezed states in bosonic Josephson junctions.
Further Publications
 Jing Li, Xi Chen, and A. Ruschhaupt, “Fast transport of BoseEinstein condensate in anharmonic traps", Phil. Trans. R. Soc. A 380: 20210280; ArXiv: 2210.03788
 Jing Li, E. Ya Sherman, and A. Ruschhaupt, “Quantum heat engine based on a spinorbit and Zeemancoupled BoseEinstein condensate”, Phys. Rev. A 106 (2022) L030201, Arxiv: 2206.05041
 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), Arxiv: 2207.02288
 C. Whitty, A. Kiely and A. Ruschhaupt, "Robustness of enhanced shortcuts to adiabaticity in lattice transport“, Physical Review A 105 (2022) 013311; Arxiv:2109.04420
 I. Alonso et. al., “Cold Atoms in Space: Community Workshop Summary and Proposed RoadMap”, EPJ Quantum Technol. 9, 30 (2022); ArXiv:2201.07789 (2022)
 A. Ruschhaupt, M. A. Simon, A. Kiely and J. G. Muga, "The Role of Symmetry in NonHermitian Scattering“, Journal of Physics: Conference Series 2038 (2021) 012020
 A. Ruschhaupt, A. Kiely, M. A. Simon and J. G. Muga, "Quantumoptical implementation of nonHermitian potentials for asymmetric scattering“, Physical Review A 102, 053705 (2020), ArXiv: 2008.01702

C. Whitty, A. Kiely and A. Ruschhaupt,"Quantum Control via Enhanced Shortcuts to Adiabaticity" Phys. Rev. Research 2, 023360 (2020), arXiv: 1912.06057

XiaoJing Lu, Andreas Ruschhaupt, Sofía MartínezGaraot and J.Gonzalo Muga, "Noise Sensitivities for an Atom Shuttled by a Moving Optical Lattice via Shortcuts to Adiabaticity", Entropy 22 (2020) 262, arXiv: 2002.03951

D. GuéryOdelin, A. Ruschhaupt, A. Kiely, E. Torrontegui, S. MartínezGaraot and J. G. Muga, "Shortcuts to adiabaticity: concepts, methods, and applications" Rev. Mod. Phys. 91, 045001 (2019), arXiv: 1904.08448
 A. Kiely, J. G. Muga and A. Ruschhaupt, "Selective population of a large angular momentum state in an optical lattice", Physical Review A 98, 053616 (2018) , ArXiv: 1803.05321
 X.J. Lu, A. Ruschhaupt and J. G. Muga, "Fast shuttling of a particle under weak springconstant noise of the moving trap“, Physical Review A 97, 053402 (2018), ArXiv: 1805.02054
 T. Dowdall and A. Ruschhaupt, "Trapping and cooling particles using a moving atom diode and an atomic mirror“, Physical Review A 97, 013412 (2018), ArXiv: 1711.01093

M. Pons, Y. Y. Cui, A. Ruschhaupt, M. A. Simón and J. G. Muga, "Local rectification of heat flux“, EPL 119, 64001 (2017), ArXiv: 1708.00408

T. Dowdall, A. Benseny, Th. Busch and A. Ruschhaupt, "Fast and robust quantum control based on Pauli blocking“, Physical Review A 96, 043601 (2017), ArXiv: 1705.04559

E. Torrontegui, I. Lizuain, S. GonzálezResines, A. Tobalina, A. Ruschhaupt, R. Kosloff and J. G. Muga, "Energy consumption for shortcuts to adiabaticity“, Physical Review A 96, 022133 (2017), ArXiv: 1704.06704

A. Benseny, A. Kiely, Y. Zhang, T. Busch and A. Ruschhaupt, "Spatial nonadiabatic passage using geometric phases“, EPJ Quantum Technology 4, 3 (2017), ArXiv: 1611.02398
 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. MartinezGaraot, U. G. Poschinger, A. Ruschhaupt and J. G. Muga, "Fast separation of two trapped ions“, New Journal of Physics 17, 093031 (2015)
 S. MartínezGaraot, 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 singleshot 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 springconstant 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)
 XL Lu, J.G. Muga, X. Chen, U. G. Poschinger, F. SchmidtKaler 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 threelevel quantum systems“, Journal of Physics B 47, 115501 (2014)
 E. Torrontegui, S. Ibánez, S. MartínezGaraot, M. Modugno, A. del Campo, D. GuéryOdelin, 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 SingleShot 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 twolevel systems: control and optimization“, Journal of Modern Optics DOI:10.1080/09500340.2013.846431 (2013)

XL Lu, X. Chen, A. Ruschhaupt, D. Alonso, S. Guérin and J.G. Muga, "Fast and robust population transfer in twolevel 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 twolevel 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 twodimensional traps“, Physical Review A 86, 043834 (2012)

E. Torrontegui, S. MartinezGaraot, A. Ruschhaupt, and J. G. Muga, "Shortcuts to adiabaticity: Fastforward approach“, Physical Review A 86, 013601 (2012)

J. Kiukas, A. Ruschhaupt, P. O. Schmidt and R. F. Werner, "Exact EnergyTime 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. GuéryOdelin 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 BoseEinstein condensates“, New Journal of Physics, 14, 013031 (2012)

E. Torrontegui, S. Ibáñez, X. Chen, A. Ruschhaupt, D. GuéryOdelin 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. GuéryOdelin 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 avoidedcrossing resonances in a 3level Λ system“, Physical Review A 82, 065602 (2010)

E. Torrontegui, J. Echanobe, A. Ruschhaupt, D. GuéryOdelin and J. G. Muga, "Coldatom dynamics in crossedlaserbeam waveguides“, Physical Review A 82, 043420 (2010)

E. Ya. Sherman, J. G. Muga, V. K. Dugaev and A. Ruschhaupt, "Strong electron spinHall 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. GuéryOdelin and J. G. Muga, "Shortcut to Adiabatic Passage in Two and ThreeLevel Atoms“, Physical Review Letters 105, 123003 (2010) (more than 260 citations)
 X. Chen, A. Ruschhaupt, S. Schmidt, A. del Campo, D. GuéryOdelin 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. GuéryOdelin, "Frictionless dynamics of BoseEinstein 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, 829846 (2009)
 A. Ruschhaupt, A. del Campo and J. G. Muga, "Momentumspace interferometry with trapped ultracold atoms“, Physical Review A 79, 023616 (2009)
 A. Ruschhaupt and J. G. Muga, "Control of atomic motion with an atomoptical 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 oneway laser barrier for cooling atoms“, European Physical Journal Special Topics 159, 127–134 (2008)
 A. Ruschhaupt and J. G. Muga, "Threedimensional effects in atom diodes: Atomoptical devices for oneway motion“, Physical Review A 76, 013619 (2007)
 A. Ruschhaupt, A. del Campo and J. G. Muga, "Momentum interferences of a freely expanding BoseEinstein condensate due to interatomic interaction change“, European Physical Journal D 40, 399403 (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, "Onephoton 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 oneway barrier for ultracold atoms“, Journal of Physics B 39, L133L138 (2006)
 A. Ruschhaupt and J. G. Muga, "Adiabatic interpretation of a twolevel atom diode, a laser device for unidirectional transmission of groundstate atoms“, Physical Review A 73, 013608 (2006)
 A. Ruschhaupt, F. Delgado and J. G. Muga, "Physical realization of PTsymmetric potential scattering in a planar slab waveguide“, Journal of Physics A 38, L171L176 (2005)
 A. Ruschhaupt, F. Delgado and J. G. Muga, "Velocity selection of ultracold atoms with FabryPerot laser devices: improvements and limits“, Journal of Physics B 38, 26652674 (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 groundstate atoms“, Physical Review A 70, 061604(R) (2004), ArXiv: quantph/0408133 (more than 62 citations)
 Ruschhaupt and J. G. Muga, "Simultaneous Arrival of Information in Absorbing Waveguides“, Physical Review Letters 93, 020403 (2004), ArXiv: quantph/0402186
 A. Ruschhaupt, B. Navarro and J. G. Muga, "Perfect detection of ultracold atoms by laserinduced ionization“, Journal of Physics B 37, L313319 (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, 17 (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. GarciaCalderon 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 quantummechanical approach to times of arrival“, Physics Letters A 313, 498501 (2003)
 A. Ruschhaupt, "Relativistic time of arrival and traversal time“, Journal of Physics A 35, 1042910443 (2002)
 A. Ruschhaupt, "A relativistic extension of event enhanced quantum theory“, Journal of Physics A 35, 92279243 (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, 22472263 (2000)
 A. Ruschhaupt, "Simulations of barrier traversal and reflection times based on event enhanced quantum theory“, Physics Letters A 250, 249256 (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)