951 citations
- Centre National de la Recherche ScientifiqueFR35 papers
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13 papers · 2 filters
Can Quantum Markov Evolutions Ever Be Dynamically Decoupled?
J. E. Gough, H. I. Nurdin
We consider the class of quantum stochastic evolutions (-models) leading to a quantum dynamical semigroup over a fixed quantum mechanical system (taken to be finite-dimensiona…
The Gisin-Percival Stochastic Schrödinger Equation from Standard Quantum Filtering Theory
John E. Gough
We show that the quantum state diffusion equation of Gisin and Percival, driven by complex Wiener noise, is equivalent up to a global stochastic phase to quantum trajectory models.…
Nonexponential quantum decay under environmental decoherence
M. Beau, J. Kiukas, I. L. Egusquiza +1
An unstable quantum state generally decays following an exponential law, as environmental decoherence is expected to prevent the decay products from recombining to reconstruct the…
Evolution-free Hamiltonian parameter estimation through Zeeman markers
Daniel Burgarth, Ashok Ajoy
We provide a protocol for Hamiltonian parameter estimation which relies only on the Zeeman effect. No time-dependent quantities need to be measured, it fully suffices to observe sp…
Positive Hamiltonians can give purely exponential decay
Daniel Burgarth, Paolo Facchi
It is commonly claimed that only Hamiltonians with a spectrum unbounded both above and below can give purely exponential decay. Because such Hamiltonians have no ground state, they…
Dynamical Decoupling of Unbounded Hamiltonians
Christian Arenz, Daniel Burgarth, Paolo Facchi +1
We investigate the possibility to suppress interactions between a finite dimensional system and an infinite dimensional environment through a fast sequence of unitary kicks on the…