Towards Quantum Experiments with Human Eyes as Detectors Based on Cloning via Stimulated Emission

Sekatski, Pavel; Brunner, Nicolás; Branciard, Cyril; Gisin, Nicolas; Simon, Christoph

doi:10.1103/physrevlett.103.113601

Cited by 77 publications

(106 citation statements)

References 18 publications

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“…Another realization of a macroscopic state is the so-called micro-macro state in which the polarization degree of freedom of a single photon is entangled with distinct states containing a large number of photons [17]. These states have been produced in a nonheralded fashion [18,19] and their characterization has been discussed in several papers [19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Heralded generation of a micro-macro entangled state

Andersen

Neergaard-Nielsen

2013

Phys. Rev. A

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Using different optical setups based on squeezed state and photon subtraction we show how optical entanglement between a macroscopic and a microscopic state-the so-called Schrödinger cat state or micro-macro state-can be generated. The entangled state is heralded and is thus produced a priori in contrast to previous proposals. We define the macroscopicity of the macroscopic part of the state as their mean distance in phase space and the success rate in discriminating them with homodyne detection, and subsequently, based on these measures we investigate the macroscopicity of different states. Furthermore, we show that the state can be used to map a microscopic qubit onto a macroscopic one thereby linking a qubit processor with a qumode processor.

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Section: Introductionmentioning

confidence: 99%

Heralded generation of a micro-macro entangled state

Andersen

Neergaard-Nielsen

2013

Phys. Rev. A

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“…Often, they involve intensity measurements, for which threshold detectors are crucial, selecting Fock states or their superpositions with sufficiently high population. Examples of low-threshold detectors are realized with single-photon on-off detectors or human eyes [1,2]. They can be applied in setups that perform positive-operator valued measurement (POVM) [3] leading to quantum operations.…”

Section: Introductionmentioning

confidence: 99%

Filtering of the absolute value of photon-number difference for two-mode macroscopic quantum superpositions

et al. 2012

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We discuss a device capable of filtering out two-mode states of light with mode populations differing by more than a certain threshold, while not revealing which mode is more populated. It would allow engineering of macroscopic quantum states of light in a way which is preserving specific superpositions. As a result, it would enhance optical phase estimation with these states as well as distinguishability of "macroscopic" qubits. We propose an optical scheme, which is a relatively simple, albeit nonideal, operational implementation of such a filter. It uses tapping of the original polarization two-mode field, with a polarization-neutral beam splitter of low reflectivity. Next, the reflected beams are suitably interfered on a polarizing beam splitter. It is oriented such that it selects unbiased polarization modes with respect to the original ones. The more an incoming two-mode Fock state is unequally populated, the more the polarizing beam-splitter output modes are equally populated. This effect is especially pronounced for highly populated states. Additionally, for such states we expect strong population correlations between the original fields and the tapped one. Thus, after a photon-number measurement of the polarizing beam-splitter outputs, a feed-forward loop can be used to let through a shutter the field, which was transmitted by the tapping beam splitter. This happens only if the counts at the outputs are roughly equal. In such a case, the transmitted field differs strongly in occupation number of the two modes, while information on which mode is more populated is nonexistent (a necessary condition for preserving superpositions).

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“…According Sekatski (Sekatski et al, 2009) "one" person could not detect entanglement by simply observing photons, for this reason they discuss about the possibility to test the quantum entanglement for several observers in order to demonstrate entanglement in a Bell-type experiment. The authors conclude that close to perfect threshold (human) detectors can be used to test quantum nonlocality without the need of any supplementary assumption.…”

Section: Our Frameworkmentioning

confidence: 99%

Quantum Entanglement: Can We "See" the Implicate Order? Philosophical Speculations

Caponigro¹,

Jiang²,

Prakash³

et al. 2010

Neuroquantology

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This brief paper argue about a possible philosophical description of the implicate order starting from a simple theoretical experiment. Utilizing an EPR source and the human eyes (as biological detectors) of a "single" person, we try to investigate the philosophical and physical implications of quantum entanglement in terms of implicate order. We know, that most specialists still disagree on the exact number of photons required to trigger a neural response, although there will be many technical challenges, we assume that neural response will be achieved in some way. The objective of paper is to investigate possible links between: quantum mechanics, quantum cognitive science, brain and mind. At the moment, the questions are more than the answers. We argue that we are perennially immersed in the implicate order and that the "real path" of quantum entanglement process is from the implicate order towards explicate order, not vice versa. Finally, we speculate about the common ground between the implicate order and chitta (Vedic theory of Mind).

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Towards Quantum Experiments with Human Eyes as Detectors Based on Cloning via Stimulated Emission

Cited by 77 publications

References 18 publications

Heralded generation of a micro-macro entangled state

Heralded generation of a micro-macro entangled state

Filtering of the absolute value of photon-number difference for two-mode macroscopic quantum superpositions

Quantum Entanglement: Can We "See" the Implicate Order? Philosophical Speculations

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