Nonclassicality and information exchange in deterministic entanglement formation

Oliveira, M. C. de; Munro, William J.

doi:10.1016/j.physleta.2003.11.037

Cited by 16 publications

(15 citation statements)

References 30 publications

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“…It has been shown that the coupling between A and B as in Hamiltonian (1) displays several interesting features [16]: (i) It leads to a complete states swapping (information exchange) even at constant mean energy. (ii) If the states are initially not entangled, the interaction will produce entanglement only if one of the modes is prepared in a nonclassical state; otherwise, if both modes are initially prepared as a direct product of coherent states the interaction will not change this character in the course of their evolution [2]. In the interaction picture, Hamiltonian (1) is written as…”

Section: Modelmentioning

confidence: 99%

Controlling quantum entanglement through photocounts

2002

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We present a protocol to generate and control quantum entanglement between the states of two subsystems (the system ${\cal S}$) by making measurements on a third subsystem (the monitor ${\cal M}$), interacting with ${\cal S}$. For the sake of comparison we consider first an ideal, or instantaneous projective measurement, as postulated by von Neumann. Then we compare it with the more realistic or generalized measurement procedure based on photocounting on ${\cal M}$. Further we consider that the interaction term (between ${\cal S}$ and ${\cal M}$) contains a quantum nondemolition variable of ${\cal S}$ and discuss the possibility and limitations for reconstructing the initial state of ${\cal S}$ from information acquired by photocounting on ${\cal M}$.Comment: 12 pages, 3 figures, accepted for publication in Phys. Rev

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Section: Modelmentioning

confidence: 99%

Controlling quantum entanglement through photocounts

2002

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“…This coupling Hamiltonian is similar in form to that one for two radiation modes interacting through a beam-splitter. It is well known that a beam-splitter can only entangle two light modes in at least one of them is non-classical [37][38][39] . Therefore, it is interesting to investigate whether or not the non-classicality of one of the states affects the process of temperature inference.…”

Section: /11mentioning

confidence: 99%

Temperature Estimation of an Entangled Pair of Trapped Ions

Neto

Costa

Prataviera

et al. 2021

Preprint

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We apply estimation theory to a system formed by two interacting trapped ions. By using the Fisher matrix formalism, we introduce a simple scheme for estimation of the temperature of the longitudinal vibrational modes of the ions. We use the ions interaction to effectively infer the temperature of the individual ions, by optimising the interaction time evolution and by measuring only over one of the ions. We also investigate the effect of a non-thermal reservoir over the inference approach. The non-classicality of one of the ions vibrational modes, introduced due to a squeezed thermal reservoir, improves the indirect inference of the individual temperatures.

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“…As is well known a beam splitter entangles only bosonic fields which are non-classical in the quantum optical sense [18][19][20], i.e., when at least one of the individual inputs is described by a negative Glauber-Sudarshan P-distribution. For that reason the term in T depending on θ 0 does not entangle the two radiation modes if they are initially in a classical state and therefore can be neglected for simplicity.…”

Section: Entanglement Generationmentioning

confidence: 99%

Capacitive coupling of two transmission line resonators mediated by the phonon number of a nanoelectromechanical oscillator

et al. 2014

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Detection of quantum features in mechanical systems at the nanoscale constitutes a challenging task, given the weak interaction with other elements and the available technics. Here we describe how the interaction between two monomodal transmission-line resonators (TLRs) mediated by vibrations of a nano-electromechanical oscillator can be described. This scheme is then employed for quantum non-demolition detection of the number of phonons in the nano-electromechanical oscillator through a direct current measurement in the output of one of the TLRs. For that to be possible an undepleted field inside one of the TLR works as a amplifier for the interaction between the mechanical resonator and the remaining TLR. We also show how how the non-classical nature of this system can be used for generation of tripartite entanglement and conditioned mechanical coherent superposition states, which may be further explored for detection processes.

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Nonclassicality and information exchange in deterministic entanglement formation

Cited by 16 publications

References 30 publications

Controlling quantum entanglement through photocounts

Controlling quantum entanglement through photocounts

Temperature Estimation of an Entangled Pair of Trapped Ions

Capacitive coupling of two transmission line resonators mediated by the phonon number of a nanoelectromechanical oscillator

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