Which-way information in a nested Mach-Zehnder interferometer

Potoček, Václav; Ferenczi, Gergely

doi:10.1103/physreva.92.023829

Cited by 37 publications

(25 citation statements)

References 10 publications

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“…In particular, it rules out the option of a continuous trajectory. The results have stirred a lively discussion in the literature [22][23][24][25][26][27][28][29][30][31][32][33] including criticism on the use of classical light and the sensitivity of the experiment. Unfortunately, the clever technique used for obtaining the "which path" information, could not be applied to single photons.…”

Section: Operational Definition Of Photonic Trajectorymentioning

confidence: 99%

Experimental observation of anomalous trajectories of single photons

et al. 2017

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A century after its conception, quantum mechanics still hold surprises that contradict many "common sense" notions. The contradiction is especially sharp in case one consider trajectories of truly quantum objects such as single photons. From a classical point of view, trajectories are well defined for particles, but not for waves. The wave-particle duality forces a breakdown of this dichotomy and quantum mechanics resolves this in a remarkable way: Trajectories can be well defined, but they are utterly different from classical trajectories. Here, we give an operational definition to the trajectory of a single photon by introducing a novel technique to mark its path using its spectral composition. The method demonstrates that the frequency degree of freedom can be used as a bona fide quantum measurement device (meter). The analysis of a number of setups, using our operational definition, leads to anomalous trajectories which are non-continuous and in some cases do not even connect the source of the photon to where it is detected. We carried out an experimental demonstration of these anomalous trajectories using a nested interferometer. We show that the Two-state vector formalism provides a simple explanation for the results.

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Section: Operational Definition Of Photonic Trajectorymentioning

confidence: 99%

Experimental observation of anomalous trajectories of single photons

et al. 2017

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“…Similarly, the strong interaction in Eqs. (9) and (42) can also be implemented using a c-phase gate, this time with ϕ = π. In this case, the unitary operator U s reads…”

Section: Operational Equivalencementioning

confidence: 99%

Interplay between strong and weak measurement: comparison of three experimental approaches to weak value estimation

Roik

Lemr

Cernoch

et al. 2020

J. Opt.

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Weak values are traditionally obtained using a weak interaction between the measured system and a pointer state. It has, however, been pointed out that weak coupling can be replaced by a carefully tailored strong interaction. This paper provides a direct comparison of two strong interaction-based approaches (strong interaction accompanied by either a suitably prepared pointer state or quantum erasure) and the traditional weak interaction-based method. Presented theoretical derivations explicitly prove analytical equivalence of these approaches which was subsequently certified by an experiment implemented on the platform of linear optics. We find that strong-interaction-based measurements are experimentally less demanding on this platform.

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“…The ratio N M tells us when the sum of displacements in the protocol (46) is smaller or larger than that of a single particle. If it is smaller for bit 1, it is larger for bit 0, and vice versa.…”

Section: The Weak Trace In "Direct Quantum Communication With Almmentioning

confidence: 99%

Counterfactuality of “counterfactual” communication

Vaidman

2014

Latin America Optics and Photonics Conference

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The counterfactuality of the recently proposed protocols for direct quantum communication is analyzed. It is argued that the protocols can be counterfactual only for one value of the transmitted bit. The protocols achieve a reduced probability of detection of the particle in the transmission channel by increasing the number of paths in the channel. However, this probability is not lower than the probability of detecting a particle actually passing through such a multi-path channel, which was found to be surprisingly small. The relation between security and counterfactuality of the protocols is discussed. An analysis of counterfactuality of the protocols in the framework of the Bohmian interpretation is performed.

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Which-way information in a nested Mach-Zehnder interferometer

Cited by 37 publications

References 10 publications

Experimental observation of anomalous trajectories of single photons

Experimental observation of anomalous trajectories of single photons

Interplay between strong and weak measurement: comparison of three experimental approaches to weak value estimation

Counterfactuality of “counterfactual” communication

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