Decoherence modes of entangled qubits within neutron interferometry

Bertlmann, Reinhold A.; Durstberger, Katharina; Hasegawa, Yuji

doi:10.1103/physreva.73.022111

Cited by 14 publications

(12 citation statements)

References 20 publications

(27 reference statements)

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“…Since the states of the magnetic field do not change in the photon exchange process, there is no entanglement between the neutron and the field, but the effects of the statistically distributed phase shifts on the observed interference pattern are equivalent to the effects of a quantum-mechanical environment [13]. For a more detailed description of the connection between noise fields and decoherence effects in the framework of Lindblad master equations, see [16].…”

Section: Introductionmentioning

confidence: 99%

Noise-induced dephasing in neutron interferometry

Sulyok¹,

Hasegawa²,

Klepp³

et al. 2010

Phys. Rev. A

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Decoherence phenomenona in a neutron interferometer are analyzed by simulation of the effects of an environment with magnetic noise fields. Basic calculations and experiments show the validity and limitations of this model system. In particular, loss and recovery of the interference pattern with controllable noise sources in both interferometer arms are discussed in detail. In addition, the decoherence behavior at high interference order, where Schrödinger-cat-like states exist in the interferometer, is investigated. While at low interference order a smearing of the interference pattern is observed, at high interference order a smearing of the modulated momentum distribution occurs.

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Section: Introductionmentioning

confidence: 99%

Noise-induced dephasing in neutron interferometry

Sulyok¹,

Hasegawa²,

Klepp³

et al. 2010

Phys. Rev. A

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“…For φ + we notice that the "decoherence" caused by the decay exceeds the purity-concurrence values of Werner states, which represent an upper limit for all possible decoherence modes in this picture given by a Lindblad equation for an initially maximally entangled qubit state, Ref. [20,21]. An early decay of one kaon, Fig.…”

Section: The Time Evolution For Two Kaonsmentioning

confidence: 99%

Nonlocality and entanglement in a strange system

Hiesmayr

2007

Eur. Phys. J. C

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We show that the relation between nonlocality and entanglement is subtler than one naively expects. In order to do this we consider the neutral kaon system-which is oscillating in time (particle-antiparticle mixing) and decaying-and describe it as an open quantum system. We consider a Bell-CHSH inequality and show a novel violation for non-maximally entangled states. Considering the change of purity and entanglement in time we find that, despite the fact that only two degrees of freedom at a certain time can be measured, the neutral kaon system does not behave like a bipartite qubit system.

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“…Neutrons, which are part of the ensemble ρ in (r ′ ), arrive at different times at the coil and experience different magnetic field strengths. We are left with the system in a mixed state r = (0, −r, 0) where r < 1 [34].…”

Section: Methodsmentioning

confidence: 99%

New aspects of geometric phases in experiments with polarized neutrons

Sponar

Klepp

Durstberger-Rennhofer

et al. 2010

J. Phys. A: Math. Theor.

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Abstract. Geometric phase phenomena in single neutrons have been observed in polarimeter and interferometer experiments. Interacting with static and time dependent magnetic fields, the state vectors acquire a geometric phase tied to the evolution within spin subspace. In a polarimeter experiment the non-additivity of quantum phases for mixed spin input states is observed. In a Si perfect-crystal interferometer experiment appearance of geometric phases, induced by interaction with an oscillating magnetic field, is verified. The total system is characterized by an entangled state, consisting of neutron and radiation fields, governed by a JaynesCummings Hamiltonian. In addition, the influence of the geometric phase on a Bell measurement, expressed by the Clauser-Horne-Shimony-Holt (CHSH) inequality, is studied. It is demonstrated that the effect of geometric phase can be balanced by an appropriate change of Bell angles.

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Decoherence modes of entangled qubits within neutron interferometry

Cited by 14 publications

References 20 publications

Noise-induced dephasing in neutron interferometry

Noise-induced dephasing in neutron interferometry

Nonlocality and entanglement in a strange system

New aspects of geometric phases in experiments with polarized neutrons

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