Browsing Quantum Systems, Information and Control by Issue Date

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  • Heule, Rahel; Bruder, Christoph; Burgarth, Daniel; Stojanović, Vladimir M. (2010)
    Motivated by some recent results of quantum control theory, we discuss the feasibility of local operator control in arrays of interacting qubits modeled as isotropic Heisenberg spin chains. Acting on one of the end spins, ...
  • Gough, John Edward; Nurdin, Hendra; Wildfeuer, Sebastian (2010-01-01)
    We show that, for arbitrary quantum feedback networks consisting of several quantum mechanical components connected by quantum fields, the limit of adiabatic elimination of fast oscillator modes in the components and the ...
  • Gough, John Edward; James, Matthew R.; Nurdin, Hendra I. (2010-02-03)
    The aim of this article is to extend linear quantum dynamical network theory to include static Bogoliubov components (such as squeezers). Within this integrated quantum network theory, we provide general methods for cascade ...
  • Köstler, Claus (2010-02-15)
    The extended de Finetti theorem characterizes exchangeable infinite sequences of random variables as conditionally i.i.d. and shows that the apparently weaker distributional symmetry of spreadability is equivalent to ...
  • Köstler, Claus (2010-02-15)
    The extended de Finetti theorem characterizes exchangeable infinite sequences of random variables as conditionally i.i.d. and shows that the apparently weaker distributional symmetry of spreadability is equivalent to ...
  • Burgarth, Daniel; Maryuama, Koji; Murphy, Michael; Montangero, Simone; Calarco, Tommaso; Nori, Franco; Plenio, Martin B. (2010-04-22)
    We apply quantum control techniques to a long spin chain by acting only on two qubits at one of its ends, thereby implementing universal quantum computation by a combination of quantum gates on these qubits and indirect ...
  • James, Matthew R.; Gough, John Edward (2010-08-01)
    The purpose of this paper is to extend J.C. Willems' theory of dissipative systems to open quantum systems described by quantum noise models. This theory, which combines ideas from quantum physics and control theory, ...
  • Burgarth, Daniel Klaus; Giovannetti, Vittorio (2010-08-19)
    In this addendum to our paper [ D. Burgarth and V. Giovannetti Phys. Rev. Lett. 99 100501 (2007)] we prove that during the transformation that allows one to enforce control by relaxation on a quantum system, the ancillary ...
  • Gough, John Edward; Köstler, Claus Michael (2010-12-01)
    We derive the form of the Belavkin-Kushner-Stratonovich equa- tion describing the ltering of a continuous observed quantum system via non-demolition measurements when the statistics of the input eld used for the indirect ...
  • Koestler, Claus (2010-12-08)
  • Koestler, Claus (2010-12-08)
  • Gough, John Edward; Guta, Madalin I.; James, Matthew R.; Nurdin, Hendra I. (2011)
    Recent developments in quantum technology mean that is it now possible to manipulate systems and measure fermion elds (e.g. reservoirs of electrons) at the quantum level. This progress has motivated some recent work on ...
  • Gough, John Edward; Guta, Madalin I.; James, Matthew R.; Nurdin, Hendra I. (2011)
    Recent developments in quantum technology mean that is it now possible to manipulate systems and measure fermion elds (e.g. reservoirs of electrons) at the quantum level. This progress has motivated some recent work on ...
  • Burgarth, Daniel; Maruyama, Koji; Nori, Franco (2011-01-14)
    A number of many-body problems can be formulated using Hamiltonians that are quadratic in the creation and annihilation operators. Here, we show how such quadratic Hamiltonians can be efficiently estimated indirectly, ...
  • Köstler, Claus (2011-01-31)
    Inspired by Lehner's results on exchangeability systems in [Leh06] we define `weak conditional freeness' and `conditional freeness' for stationary processes in an operator algebraic framework of noncommutative probability. ...
  • Heule, Rahel; Bruder, Christoph; Stojanović, Vladimir M.; Burgarth, Daniel (2011-08-31)
    We investigate anisotropic XXZ Heisenberg spin-1/2 chains with control fields acting on one of the end spins, with the aim of exploring local quantum control in arrays of interacting qubits. In this work, which uses a recent ...
  • Sinaysky, Ilya; Petruccione, Francesco; Burgarth, Daniel Klaus (2011-09-26)
    The dynamics of a simple spin chain (two spins) coupled to bosonic baths at different temperatures is studied. The analytical solution for the reduced density matrix of the system is found. The dynamics and temperature ...
  • Yuasa, Kazuya; Burgarth, Daniel Klaus; Giovannetti, Vittorio; Nakazato, Hiromichi (2011-09-26)
    A scheme for preparing two fixed noninteracting qubits in a maximally entangled state is presented. By repeating on- and off-resonant scattering of ancilla qubits, the target qubits are driven from an arbitrary initial ...
  • Nori, Franco; Maruyama, Koji; Burgarth, Daniel (2011-09-26)
    Quantum control requires full knowledge of the system many-body Hamiltonian. In many cases this information is not directly available due to restricted access to the system. Here we show how to indirectly estimate all the ...
  • Burgarth, Daniel; Giovannetti, Vittorio (2011-09-27)
    We discuss an explicit protocol which allows one to externally cool and control a composite system by operating on a small subset of it. The scheme permits to transfer arbitrary and unknown quantum states from a memory on ...

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