深夜亚洲福利久久

Skip to main content

Recent Publications

  • Jukka Kiukas and Andreas Ruschhaupt, "Fisher information for the momentum parameter from quantum many-particle arrival time measurements", New Journal of Physics 27,  

    We formulate a quantum arrival time measurement process for a Bosonic many-particle system, with the aim of extracting statistical information on single-particle properties. The arrival time is based on a dynamical multi-particle absorption model in the Fock space, and we consider systems in coherent and incoherent mixtures of N-particle states. We find the resulting probability distributions for arrival time sequences, which we consider as parametric models for the statistical inference of single-particle parameters, and derive a tractable expression for the associated (classical) Fisher information for a general single particle parameter. Subsequently focusing on the concrete case of the momentum parameter of a 1D particle, we consider the idealised limits of a point (Dirac delta) detector and an infinite particle system forming a spatially uniform 鈥榖eam鈥�. We observe that even though no information remains in the spatial distribution, the single-particle momentum is indeed identifiable from the arrival time data, even in the limit of 鈥榮parse beams鈥� of vanishing particle density, where we obtain simple analytical form for the Fisher information, which, interestingly, coincides with the one obtained from a hypothetical time-stationary detection model. Our results contribute to the fundamental understanding of temporal measurement data arising from quantum systems consisting of freely evolving particles.

  • Andreas Ruschhaupt and Juan Gonzalo Muga, "Maxwell demon no-go theorem for multichannel scattering",
    Recent implementations of Maxwell demons and other devices exhibiting asymmetric response to particles incident from opposite directions have raised conceptual and practical interest. According to quantum-scattering-theory selection rules, demons necessitate, among other conditions, non-local and non-Hermitian potentials. These potentials arise as effective interactions for a single asymptotic channel within a multichannel (large, Hermitian) system. However we find that, regardless of the complexity of the large Hamiltonian, the demon behavior cannot be approached in this way. We discuss the consequences and possible resolutions of the ensuing paradox. We also introduce and examine a parameter to quantify the distance to demon behavior and propose a way to construct devices as close to a demonic behaviour as possible in a quantum-optical setup.

  • Manuel Odelli, Andreas Ruschhaupt, Vladimir M. Stojanovic, "Enhanced twist-and-turn dynamics of spin squeezing in internal bosonic Josephson junctions",
    The twist-and-turn dynamics of spin squeezing results from the interplay of the (nonlinear) one-axis-twisting- and the (linear) transverse-field turning term in the underlying Hamiltonian, both with constant (time-independent) 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 spin-squeezed states in internal bosonic Josephson junctions -- condensates of cold bosonic atoms in two different internal (hyperfine) states (single-boson 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 single-boson modes and that the nonlinear-coupling strength in this system remains constant, we set out to determine the time-dependence of the linear-coupling strength using the STA and eSTA approaches. We then quantitatively characterize the modified twist-and-turn dynamics in this system by evaluating the coherent spin-squeezing- and number-squeezing parameters, as well as the fidelity of the target spin-squeezed states.
    In this manner, we show that the eSTA approach allows for a particularly robust experimental realization of strongly spin-squeezed states in this system, consistently outperforming its adiabatic and STA-based counterparts, even for systems with several hundred particles.

  • Muhammad S. Hasan, Thom谩s Fogarty, Jing Li, Andreas Ruschhaupt, Thomas Busch, "High fidelity control of a many-body Tonks--Girardeau gas with an effective mean-field approach", ;  
    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 self-similar dynamics. However, finding an exact STA for strongly correlated many-body systems can be difficult, as their complex dynamics may not be easily described, especially for larger systems that do not possess self-similar solutions. Here, we design STAs for one-dimensional bosonic gas in the Tonks-Girardeau limit by using a mean-field approach that succinctly captures the strong interaction effects through a quintic nonlinear term in the Schr枚dinger equation. We show that for the case of the harmonic oscillator with a time-dependent trap frequency the mean-field approach works exactly and recovers the well-known 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 Rabi-coupled Bose-Einstein condensate",  
    We explore the dynamics of a hybrid classical-quantum system consisting of a classical piston and a self-interacting pseudospin 1/2 Bose-Einstein condensate with a time-dependent Rabi coupling. We investigate the mechanical work produced by the piston moving as a result of the quantum pressure of the condensate. The time-dependent 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 time-dependent 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", ;  
    We investigate a time-efficient and robust preparation of spin-squeezed states -- a class of states of interest for quantum-enhanced metrology--in internal bosonic Josephson junctions with a time-dependent nonlinear coupling strength between atoms in two different hyperfine states. We treat this state-preparation problem, which had previously been addressed using shortcuts to adiabaticity (STA), using the recently proposed analytical modification of this class of quantum-control protocols that became known as the enhanced STA (eSTA) method. We characterize the state-preparation process by evaluating the time dependence of the coherent spin-squeezing and number-squeezing parameters and the target-state fidelity. We show that the state-preparation 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 spin-squeezed states in bosonic Josephson junctions.

Further Publications

  • Jing Li, Xi Chen, and A. Ruschhaupt, 鈥淔ast transport of Bose-Einstein condensate in anharmonic traps", ; 

  • Jing Li, E. Ya Sherman, and A. Ruschhaupt, 鈥淨uantum heat engine based on a spin-orbit- and Zeeman-coupled Bose-Einstein condensate鈥�, ,  

  • C. Whitty, A. Kiely and A. Ruschhaupt, "Improved anharmonic trap expansion through enhanced shortcuts to adiabaticity鈥�, , 

  • C. Whitty, A. Kiely and A. Ruschhaupt, "Robustness of enhanced shortcuts to adiabaticity in lattice transport鈥�, ; 
     
  • I. Alonso et. al., 鈥淐old Atoms in Space: Community Workshop Summary and Proposed Road-Map鈥�, ;  

  • A. Ruschhaupt, M. A. Simon, A. Kiely and J. G. Muga, "The Role of Symmetry in Non-Hermitian Scattering鈥�, 
  • A. Ruschhaupt, A. Kiely, M. A. Simon and J. G. Muga, "Quantum-optical implementation of non-Hermitian potentials for asymmetric scattering鈥�, , 

  • C. Whitty, A. Kiely and A. Ruschhaupt,"Quantum Control via Enhanced Shortcuts to Adiabaticity"  , 

  • Xiao-Jing Lu, Andreas Ruschhaupt, Sof铆a Mart铆nez-Garaot and J.Gonzalo Muga, "Noise Sensitivities for an Atom Shuttled by a Moving Optical Lattice via Shortcuts to Adiabaticity",  

  • D. Gu茅ry-Odelin, A. Ruschhaupt, A. Kiely, E. Torrontegui, S. Mart铆nez-Garaot and J. G. Muga, "Shortcuts to adiabaticity: concepts, methods, and applications" ,  

  • A. Kiely, J. G. Muga and A. Ruschhaupt, "Selective population of a large angular momentum state in an optical lattice",, 
  • X.-J. Lu, A. Ruschhaupt and J. G. Muga, "Fast shuttling of a particle under weak spring-constant noise of the moving trap鈥�,  
  • T. Dowdall and A. Ruschhaupt, "Trapping and cooling particles using a moving atom diode and an atomic mirror鈥�, , 

  • M. Pons, Y. Y. Cui, A. Ruschhaupt, M. A. Sim贸n and J. G. Muga, "Local rectification of heat flux鈥�,, 

  • T. Dowdall, A. Benseny, Th. Busch and A. Ruschhaupt, "Fast and robust quantum control based on Pauli blocking鈥�, , 

  • E. Torrontegui, I. Lizuain, S. Gonz谩lez-Resines, A. Tobalina, A. Ruschhaupt, R. Kosloff and J. G. Muga, "Energy consumption for shortcuts to adiabaticity鈥�, , 

  • A. Benseny, A. Kiely, Y. Zhang, T. Busch and A. Ruschhaupt, "Spatial non-adiabatic passage using geometric phases鈥�,  

  • A. Kiely, J. G. Muga and A. Ruschhaupt, "Effect of Poisson noise on adiabatic quantum control鈥�,  
  • A. Kiely, A. Benseny, Th. Busch and A. Ruschhaupt, "Shaken, not stirred: Creating exotic angular momentum states by shaking an optical lattice", 
  • M. Palmero, S. Martinez-Garaot, U. G. Poschinger, A. Ruschhaupt and J. G. Muga, "Fast separation of two trapped ions鈥�, 

  • S. Mart铆nez-Garaot, A. Ruschhaupt, J. Gillet, Th. Busch and J. G. Muga, "Fast quasiadiabatic dynamics鈥�, 

  • M. Ndong,G. Djotyan, A. Ruschhaupt and S. Guerin, "Robust coherent superposition of states by single-shot shaped pulse鈥�, 

  • X.-J. Lu, M. Palmero, A. Ruschhaupt, Xi Chen and J. G. Muga, "Optimal transport of two ions under slow spring-constant drifts鈥�, 

  • A. Kiely, J. P. L. McGuinness, J. G. Muga and A. Ruschhaupt, "Fast and stable manipulation of a charged particle in a Penning trap鈥�, 

  • 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鈥�, Physical Review A 89, 063414 (2014)

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

  • E. Torrontegui, S. Ib谩nez, S. Mart铆nez-Garaot, M. Modugno, A. del Campo, D. Gu茅ry-Odelin, A. Ruschhaupt, X. Chen and J. G. Muga, "Shortcuts to Adiabaticity鈥�, ,  (more than 360 citations)

  • D. Daems, A, Ruschhaupt, D. Sugny and S. Gu茅rin, "Robust Quantum Control by a Single-Shot Shaped Pulse鈥�, ,  (more than 80 citations)

  • A. Ruschhaupt and J.G. Muga, "Shortcuts to adiabaticity in two-level systems: control and optimization鈥�, Journal of Modern Optics DOI:10.1080/09500340.2013.846431 (2013)

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

  • J. Kiukas, A. Ruschhaupt and R.F. Werner, "Full counting statistics of stationary particle beams鈥�, 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鈥�, ,  (more than 150 citations)

  • S. Ib谩nez, X. Chen,  E. Torrontegui, J. G. Muga and A. Ruschhaupt, "Multiple Schr枚dinger Pictures and Dynamics in Shortcuts to Adiabaticity鈥�, ,  (more than 115 citations)

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

  • E. Torrontegui, S. Martinez-Garaot, A. Ruschhaupt, and J. G. Muga, "Shortcuts to adiabaticity: Fast-forward approach鈥�, 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鈥�, Journal of Physics A 45, 185301 (2012)

  • W. Schmunk, M. Gramegna, G. Brida, I. P. Degiovanni, M. Genovese, H. Hofer, S. K眉ck, 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鈥�, Metrologia 49, S156 (2012)

  • E. Torrontegui, X. Chen, M. Modugno, S. Schmidt, A. Ruschhaupt , D. Gu茅ry-Odelin and J. G. Muga, "Transitionless expansion of cold atoms in optical Gaussian beam traps鈥�, 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鈥�, New Journal of Physics, 14, 013031 (2012)

  • E. Torrontegui, S. Ib谩帽ez, X. Chen, A. Ruschhaupt, D. Gu茅ry-Odelin and J. G. Muga, "Fast atomic transport without vibrational heating鈥�,  (more than 125 citations)

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

  • J. G. Muga, X. Chen, E. Torrontegui, S. Ib谩帽ez, I. Lizuain and A. Ruschhaupt, "Shortcuts to quantum adiabatic processes鈥�, 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 螞 system鈥�, Physical Review A 82, 065602 (2010)

  • E. Torrontegui, J. Echanobe, A. Ruschhaupt, D. Gu茅ry-Odelin and J. G. Muga, "Cold-atom dynamics in crossed-laser-beam waveguides鈥�, 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鈥�, Semiconductor Science and Technology 25, 0905004 (2010)

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

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

  • X. Chen, I. Lizuain, A. Ruschhaupt, D. Gu茅ry-Odelin and J. G. Muga, "Shortcut to Adiabatic Passage in Two- and Three-Level Atoms鈥�,  (more than 260 citations)

  • X. Chen, A. Ruschhaupt, S. Schmidt, A. del Campo,   D. Gu茅ry-Odelin and J. G. Muga, "Fast Optimal Frictionless Atom Cooling in Harmonic Traps: Shortcut to Adiabaticity鈥�,  (more than 285 citations)

  • J. G. Muga, Xi Chen, A. Ruschhaupt and D. Gu茅ry-Odelin, "Frictionless dynamics of Bose-Einstein condensates under fast trap variations鈥�,  (more than 100 citations)

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

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

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

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

  • A. Ruschhaupt and J. G. Muga, "Control of atomic motion with an atom-optical diode on a ring鈥�, 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鈥�, European Physical Journal Special Topics 159, 127鈥�134 (2008)

  • A. Ruschhaupt and J. G. Muga, "Three-dimensional effects in atom diodes: Atom-optical devices for one-way motion鈥�, 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鈥�, 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鈥�, Physical Review A 74, 063618 (2006)

  • I. Lizuain, J. G. Muga and A. Ruschhaupt, "Laser excitation of transverse modes in an atomic waveguide鈥�, 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鈥�, 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鈥�, 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鈥�, 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鈥�, 

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

  • Ph. Blanchard, T. Krueger and A. Ruschhaupt, "Small world graphs by iterated local edge formation鈥�, 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鈥�, ,  (more than 62 citations)

  • Ruschhaupt and J. G. Muga, "Simultaneous Arrival of Information in Absorbing Waveguides鈥�, , 

  • A. Ruschhaupt, B. Navarro and J. G. Muga, "Perfect detection of ultra-cold atoms by laser-induced ionization鈥�, 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鈥�, Europhysics Letters 67, 1-7 (2004)

  • F. Delgado, J. G. Muga and A. Ruschhaupt, "Ultrafast propagation of Schr枚dinger waves in absorbing media鈥�, 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鈥�, 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鈥�, Physics Letters A 313, 498-501 (2003)

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

  • A. Ruschhaupt, "A relativistic extension of event enhanced quantum theory鈥�, 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鈥�, Journal of Modern Optics 47, 2247-2263 (2000)

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

Scientific Book

  • "Time in Quantum Mechanics - Vol. 2鈥�
    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鈥� in "The Message of Quantum Science鈥� (Ph. Blanchard, J. Fr枚hlich, Editoren, Springer, 2015)

  • A. Ruschhaupt, J. G. Muga and G. C. Hegerfeldt, "Detector models for the quantum time of arrival鈥�, in "Time in Quantum Mechanics - Vol. 2鈥� (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鈥� in Ph. Blanchard et. al. (Editoren) "Decoherence: Theoretical, Experimental, and Conceptual Problems鈥� (LNP 538, Springer, 2000)

Quantum Control via Shortcuts to Adiabaticity

Contact us

Room 216A, 2nd floor, School of Physics, 深夜亚洲福利久久 College Cork, Cork, Ireland,

Connect with us

Top