Measurement of Time Delays in the Parametric Production of Photon Pairs

Friberg, Stephen R.; Cao, Hong; Mandeļ, L.

doi:10.1103/physrevlett.54.2011

Cited by 195 publications

(65 citation statements)

References 22 publications

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“…Many of the traditional tests of quantum mechanics (using the Bell inequalities [1,2]) oscillators to generate correlated photon number states [3][4][5]. When these correlated photon pairs (the signal and idler) are passed through polarizers or beam splitter/phase shifters and measured by single photon detectors, a test of the Bell inequality can be achieved.…”

Section: (Received 30 March 1998)mentioning

confidence: 99%

Characterizing Greenberger-Horne-Zeilinger Correlations in Nondegenerate Parametric Oscillation via Phase Measurements

Munro

Milburn

1998

Phys. Rev. Lett.

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Section: (Received 30 March 1998)mentioning

confidence: 99%

Characterizing Greenberger-Horne-Zeilinger Correlations in Nondegenerate Parametric Oscillation via Phase Measurements

Munro

Milburn

1998

Phys. Rev. Lett.

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“…It becomes apparent that while the former is defined by a group velocity mismatch term τ s between the pump and the signal photon, the latter is defined by a group velocity mismatch term τ − between the trigger and the signal photons. It should also be stressed that the correlation time does not depend on the pump bandwidth [17].…”

Section: Chronocyclic Wigner Functionmentioning

confidence: 99%

Generation of Fourier-transform-limited heralded single photons

2007

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In this paper we study the spectral (temporal) properties of heralded single photon wavepackets, triggered by the detection of an idler photon in the process of parametric downconversion. The generated single photons are studied within the framework of the chronocyclic Wigner function, from which the single photon spectral width and temporal duration can be computed. We derive specific conditions on the two-photon joint spectral amplitude which result in both pure and Fouriertransform limited heralded single photons. Likewise, we present specific source geometries which lead to the fulfilment of these conditions and show that one of these geometries leads, for a given pump bandwidth, to the temporally shortest possible heralded single photon wavepackets.

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“…In the experiments by Freedman & Clauser (1972) (Friberg et al 1985;Hong et al 1987). The temporal and spatial resolution may still be a problem if the two photons are not created at the same time and spot in the crystal.…”

Section: Bell's Theorem and Photon Entanglementmentioning

confidence: 99%

“…Consider a pair of (presumed entangled) photons, one propagating along the positive (right) x-axis and one along the negative (left) x-axis. They can be produced at a beam-splitter from photon beams of an OPA crystal (Friberg et al 1985;Kim, 2003; 'heralding' photons may be used to keep track of the photon pair). Introduce then a (black absorbing) beamstop at x 0 , just after that the right-hand photon has passed, and another beamstop at −2x 0 just before the left-hand photon is to pass.…”

Section: Future Experimentsmentioning

confidence: 99%

Quantum entanglement: facts and fiction – how wrong was Einstein after all?

Nordén

2016

Quart. Rev. Biophys.

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Abstract. Einstein was wrong with his 1927 Solvay Conference claim that quantum mechanics is incomplete and incapable of describing diffraction of single particles. However, the Einstein-Podolsky-Rosen paradox of entangled pairs of particles remains lurking with its 'spooky action at a distance'. In molecules quantum entanglement can be viewed as basis of both chemical bonding and excitonic states. The latter are important in many biophysical contexts and involve coupling between subsystems in which virtual excitations lead to eigenstates of the total Hamiltonian, but not for the separate subsystems. The author questions whether atomic or photonic systems may be probed to prove that particles or photons may stay entangled over large distances and display the immediate communication with each other that so concerned Einstein. A dissociating hydrogen molecule is taken as a model of a zero-spin entangled system whose angular momenta are in principle possible to probe for this purpose. In practice, however, spins randomize as a result of interactions with surrounding fields and matter. Similarly, no experiment seems yet to provide unambiguous evidence of remaining entanglement between single photons at large separations in absence of mutual interaction, or about immediate (superluminal) communication. This forces us to reflect again on what Einstein really had in mind with the paradox, viz. a probabilistic interpretation of a wave function for an ensemble of identically prepared states, rather than as a statement about single particles. Such a prepared state of many particles would lack properties of quantum entanglement that make it so special, including the uncertainty upon which safe quantum communication is assumed to rest. An example is Zewail's experiment showing visible resonance in the dissociation of a coherently vibrating ensemble of NaI molecules apparently violating the uncertainty principle. Einstein was wrong about diffracting single photons where space-like anti-bunching observations have proven recently their non-local character and how observation in one point can remotely affect the outcome in other points. By contrast, long range photon entanglement with immediate, superluminal response is still an elusive, possibly partly misunderstood issue. The author proposes that photons may entangle over large distances only if some interaction exists via fields that cannot propagate faster than the speed of light. An experiment to settle this 'interaction hypothesis' is suggested.In 1935, Einstein, Podolsky and Rosen (EPR) presented a paradox, which seemed to imply a fundamental discrepancy between quantum and classical mechanics and which they meant proves that the former is not a 'complete theory' . Einstein (1936) elaborated on the theme with a more nuanced description later, in what sense he considers quantum mechanics (QM) incomplete. His concern that it is the way QM is applied to singular particulate systems rather than whether it is a correct theory, was my inspiration for revisiting these grounds a...

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Measurement of Time Delays in the Parametric Production of Photon Pairs

Cited by 195 publications

References 22 publications

Characterizing Greenberger-Horne-Zeilinger Correlations in Nondegenerate Parametric Oscillation via Phase Measurements

Characterizing Greenberger-Horne-Zeilinger Correlations in Nondegenerate Parametric Oscillation via Phase Measurements

Generation of Fourier-transform-limited heralded single photons

Quantum entanglement: facts and fiction – how wrong was Einstein after all?

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