Observation of nonlocal interference in separated photon channels

Ou, Z. Y.; Zou, X. Y.; Lj, Wang; Mandeļ, L.

doi:10.1103/physrevlett.65.321

Cited by 209 publications

(116 citation statements)

References 11 publications

Supporting

Mentioning

113

Contrasting

Unclassified

Order By: Relevance

“…For such an implementation the delocalization of the two-photon mean position corresponds to the coherence length of the pump (up to a few meters), while the typical values are λ 0 = 2π/k 0 ≃ 700 nm and ∆x ≃ 500 µm, [8][9][10][11][12][13][14][15]44,45 respectively.…”

Section: Fig 1: Schematics Of the Franson Interferometer (Optical Immentioning

confidence: 99%

“…centered at x = 0 and spread over an interval ∆x ∼ 1/∆k (the first-order coherence length of the emitted field [8][9][10][11][12][13][14][15] ). The state |Ψ in (1) can be seen as the state produced via two-photon emission by a three-level atom, 3 in which the decay of a high-energy level ω 0 of long lifetime yields a couple of correlated pulses having opposite polarizations and complementary energies and momenta.…”

Section: Fig 1: Schematics Of the Franson Interferometer (Optical Immentioning

confidence: 99%

“…Numerous realizations of the Franson scheme have been implemented in optics probing either two-photon states produced via a parametric down-conversion process, [8][9][10][11][12][13][14][15] or entangled photon-hole states 16 produced via two-photon absorbing processes. The same technique has also been experimentally tested with pairs of surface plasmons excited with a two-photon entangled source, 17 and it has been proposed for characterizing coherent transport in two-dimensional mesoscopic conductors.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Probing Cooper pairs with Franson interferometry

Giovannetti

Yuasa

2012

Phys. Rev. B

View full text Add to dashboard Cite

A setup based on the Franson optical interferometer is analyzed, which allows us to detect the coherence properties of Cooper pairs emerging via tunneling from a superconductor in contact with two one-dimensional channels. By tuning the system parameters we show that both the internal coherence of the emitted Cooper pairs, which is proportional to Pippard's length, and the de Broglie wavelength of their center-of-mass motion can be measured via current-current correlation measurements.

show abstract

Section: Fig 1: Schematics Of the Franson Interferometer (Optical Immentioning

confidence: 99%

Section: Fig 1: Schematics Of the Franson Interferometer (Optical Immentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Probing Cooper pairs with Franson interferometry

Giovannetti

Yuasa

2012

Phys. Rev. B

View full text Add to dashboard Cite

show abstract

“…They also claimed that interference in their non-local double-slit could be described in terms of virtual path indistinguishability. Yet, this explanation is not necessary, considering that photons definitely followed independent non-intersecting paths, and the effect is known to happen even in the absence of such apertures (such as in [11,12], discussed above). Consequently, photons must have interacted from perfectly distinguishable paths, just like in the previous two experiments.…”

mentioning

confidence: 99%

“…In other words, this is an interference process between photons from separate paths, in which we have complete fringe visibility and complete path knowledge. For example, Ou et al [11] have sent pairs of entangled photons through two independent unbalanced Michelson interferometers. Two fixed detectors were used to count the photons from each path.…”

mentioning

confidence: 99%

What Is A Quantum Really Like?

Mardari¹

2006

AIP Conference Proceedings

View full text Add to dashboard Cite

Abstract. The hypothesis of quantum self-interference is not directly observable, but has at least three necessary implications. First, a quantum entity must have no less than two open paths. Second, the size of the interval between any two consecutive quanta must be irrelevant. Third, which-path information must not be available to any observer. All of these predictions have been tested and found to be false. A similar demonstration is provided for the hypothesis of quantum erasure. In contrast, if quanta are treated as real particles, acting as sources of real waves, then all types of interference can be explained with a single causal mechanism, without logical or experimental inconsistencies.Keywords: Self-interference, Quantum Erasure, Photon, Wave-Particle Dualism. PACS: 03.65.Ta, 14.70.Bh, 42.50.Xa. In the early days of quantum mechanics, there were no easy ways to test its interpretations. More often than not, scientists had to rely on thought experiments. In our days, on the other hand, it is hard to come up with a quantum property that is not already testable. Granted, some features of quantum systems are undetectable by definition. However, unobservable causes are only relevant if they produce observable outcomes. Therefore, any hypothesis about quantum properties can be verified by checking its necessary implications against actual experimental data. For example, the concept of self-interference leads to three major predictions. Firstly, a particle must cover more than one path if it is to interfere with itself. This might happen through non-local propagation, or local splittingrecombination. Either way, it must be essential to have two open paths (or more) for every single photon, whenever self-interference is at work. Secondly, the presence or absence of other quanta must be of no consequence. Large numbers of coherent photons are still necessary for the detection of fringes, but the size of the interval between any two consecutive quanta must be irrelevant. They could be light-years away from each other, as far as selfinterference is concerned. Thirdly, it is also known that interference vanishes whenever direct path verification is attempted. This is frequently cited as proof that path distinguishability destroys self-interference. If so, any indication about actual photonic trajectories, even if obtained by non-invasive means, should be incompatible with the observation of fringes in the same experiment. All of these implications have been tested extensively, often with surprising results. An overview of representative findings is presented below.The first prediction of self-interference, regarding the necessity of multiple paths for individual quanta, was tested in a very creative way by Sillitto and Wykes [1]. They used an electric shutter to switch on and off the paths of a Young interferometer. Specifically, they made sure that the two paths were never open at the same time, yet both of them were switched several times before a photon had time to reach the detector. The rate of emission wa...

show abstract

Strahlteilungs‐ und Interferenzexperimente mit Photonenpaaren

et al. 1991

View full text Add to dashboard Cite

Den Annalen der Physik zum 200. Geburtstag gewidmet I n h a l t s u b e r s i c h t . Wir fuhren eine Reihe vonklementaren OptischenExperimenten mit einem rlichtklassischen Lichtfeld durch, das iiber pilrametrische Fluoreszenz erzeugt wird und die Besonderheit aufweist, daR die Photonen ausschliefilich paarweise auftreten. Beim Auftreffen auf einen vcrlustfreien, t.ei1durchlSssigen Spiegel werden die Photonen eines Paares gemiil3 einer Binomiillverteilung auf das reflekticrte und das trnnsmittierte Bundel verteilt. Dieses Ergebnis ist unabhlingig vom Koharenzgrad. Die beobachtete Invarianz der Verteilung kiinn auf eine Balmce zwischen quantenmechanischen Stimulations-und Interferenzeffekten in den Ein-und dusgangsarmen des Strahlteilers zuriickgefuhrt werden. Beim zwcimaligen Durchlaufen eines Strahlteilers in einem Michelson-Interferomrter treten Interferenzen zwischen den verschiedenen moglichen Zweiphotonenzustanden im Interferometer auf. Das Korreliltions-Interferogramm fur Photonenpailre besitzt eine hohere Auflijsung ids das Intensitats-Interferogramm fur die Transmission einzelner Photonen. Wir deuten dieses Verhalten als quantenmechanische Interferenz zwischen der groderen Zalil von Mijglichkeiten, die ein Photonenpaar im Vergleich zu einzelnen Photonen hat, das Interferometer zu durchlaufen. Die Anwmdung dicser uberlegungen auf Lichtfelder mit Paaren von Photonen unterschicdlicher Energie fiihrt zu Korrelations-Interferogrommen, die deutlich von den rnit klassischen Feldern aufgenommrnen Interferogrammen abweichen.A b s t r a c t . We perform a series of elementary optical experiments with a nonclassicd lightfield generated in the process of spontaneous parametric down-conversion. This lightfield consists of photon pairs only. When the photon pairs fall on a lossless beam splitter the photons are distributed among the trnnsmitted and reflected beam according to the binomial distribution. The result is indeprndent of the degree of coherence. The invariance of the distribution can be understood as a balance between quantum mechanical stimulation and interference effects in the input and output arms of the beam splitter. In application to D Michelson interferometer in which the beam splitter is passed twice we have to consider interferences between the possible two-photon states. Compared to conventional Michelson interferograms the measured correlation interferogram for photon pairs exhibits a higher resolution. We explain this behavior MI due to quantum mechanical interference between the larger number of ways a photon pair can traverse the interferometer compared to single photons. Applied to lightfields in which the photons of a pair have different energies these considerations lead to correlation interferogrilms which differ significautly from those recorded with classical lightfields.

show abstract

Observation of nonlocal interference in separated photon channels

Cited by 209 publications

References 11 publications

Probing Cooper pairs with Franson interferometry

Probing Cooper pairs with Franson interferometry

What Is A Quantum Really Like?

Strahlteilungs‐ und Interferenzexperimente mit Photonenpaaren

Contact Info

Product

Resources

About