Browsing by Author "Gough, John"

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  • Gough, John (2015-01)
    We introduce the characteristic operator as the generalization of the usual concept of a transfer function of linear input-plant-output systems to arbitrary quantum nonlinear Markovian input-output models. This is intended ...
  • Emary, Clive; Gough, John (2014-11-26)
    We discuss control of the quantum-transport properties of a mesoscopic device by connecting it in a coherent feedback loop with a quantum-mechanical controller. We work in a scattering approach and derive results for the ...
  • Gough, John (2014-12-03)
    Quantum feedback networks have been introduced in quantum optics as a set of rules for constructing arbitrary networks of quantum mechanical systems connected by uni-directional quantum optical fields, and has allowed for ...
  • Gough, John; Zhang, Guofeng (2015-06-19)
    We give explicit constructions of quantum dynamical filters which generate nonclassical states (coherent states, cat states, shaped single and multi-photon states) of quantum optical fields as inputs to general quantum ...
  • Gough, John (2015-06)
    The aim of this paper is to derive the global Hamiltonian form for a quantum system and bath, or more generally a quantum network with multiple quantum input field connections, based on the local descriptions. We give a new ...
  • Gough, John; Nurdin, H. I. (2015-09-01)
    In this paper, we show that quantum memory for qudit states encoded in a single photon pulsed optical eld has a conceptually simple modular realization using only passive linear optics and coherent feedback. We exploit the ...
  • Gough, John; Ratiu, Tudor S.; Smolyanov, Oleg G. (2015)
    Noether’s theorem on constants of the motion of dynamical systems has recently been extended to classical dissipative systems (Markovian semi-groups) by Baez and Fong [J. Math. Phys. 54, 013301 (2013)]. We show how to ...
  • Andreou, Christiana (Aberystwyth UniversityMathematical and Physical Sciences, 2013)
  • Gough, John; Zhang, Guofeng (2015-09)
    The purpose of this paper is to study the realization theory of quantum linear systems. It is shown that for a general quantum linear system its controllability and observability are equivalent and they can be checked by ...
  • Gough, John (2015-01-05)
    The derivation of a quantum Markovian model for an optomechanical system consisting of a quantum mechanical mirror interacting with quantum optical input fields via radiation pressure is a difficult problem which ultimately ...
  • Gough, John; Ratiu, Tudor S.; Smolyanov, Oleg (2015-11)
    This papers deals with connections between quantum anomalies and transformations of Feynman pseudo-measures. Mathematical objects related to the notion of the volume element in an infinite-dimensional space considered in ...
  • Gough, John; Ratiu, Tudor S.; Smolyanov, Oleg (2015-11)
    This papers deals with connections between quantum anomalies and transformations of Feynman pseudo-measures. Mathematical objects related to the notion of the volume element in an infinite-dimensional space considered in ...
  • Gough, John; Ratiu, Tudor S.; Smolyanov, Oleg (2015-11)
    This papers deals with connections between quantum anomalies and transformations of Feynman pseudo-measures. Mathematical objects related to the notion of the volume element in an infinite-dimensional space considered in ...
  • Wildfeuer, Sebastian (Aberystwyth UniversityMathematical and Physical Sciences, 2013)
    Classical feedback control and system theory are playing an important role in modelling, controlling and analysing complex devices in many branches of engineering. Recent developments like quantum computers and miniaturisation ...
  • Gough, John (2015-09)
    We introduce the concept of Poisson Brackets for classical noise and, in particular, for pairs of canonically conjugate Wiener processes (symplectic noise). Phase space diffusions driven by these processes are considered ...
  • Gohm, Rolf; Gough, John; Nurdin, Hendra; Bouten, Luc (2015-04-30)
    Using the Trotter-Kato theorem we prove the convergence of the unitary dynamics generated by an increasingly singular Hamiltonian in the case of a single field coupling. The limit dynamics is a quantum stochastic evolution ...
  • Gough, John; Ratiu, Tudor S.; Smolianov, O. G. (2015-03-01)
    This paper considers Wigner functions and measures for infinite-dimensional open quantum systems; important examples of such systems are objects of quantum control theory. An axiomatic definition of coherent quantum feedback ...