898 citations · 5.1k across the 121 of their papers we have counts for
108 papers · 1 filter
Comment on "Photons can tell 'contradictory' answer about where they have been''
Gregory Reznik, Carlotta Versmold, Jan Dziewior +4
Yuan and Feng [Eur. Phys. J. Plus 138:70, 2023] recently proposed a modification of the nested Mach-Zehnder interferometer experiment performed by Danan et al. [Phys. Rev. Lett. 11…
Counterfactual communication without a trace in the transmission channel
Wei-Wei Pan, Xiao Liu, Xiao-Ye Xu +10
We report an experimental realization of a modified counterfactual communication protocol that eliminates the dominant environmental trace left by photons passing through the trans…
Comment on "Multitime quantum communication: Interesting but not counterfactual"
Lev Vaidman
In a recent paper, Robert Griffiths [Phys. Rev. A 107, 062219 (2023)] analyzed a protocol for transmission of information between two parties introduced by Salih et al. [Phys. Rev.…
Comment on "Weak values and the past of a quantum particle"
Lev Vaidman
In a recent paper, Hance, Rarity and Ladyman [Phys. Rev. Res. {\bf 5}, 023048 (2023)] criticized recent proposals connecting weak values and the past of a quantum particle. I argue…
Counterportation and the two-state vector formalism
Justin Dressel, Gregory Reznik, Lev Vaidman
Hatim Salih discovered a method for transferring a quantum state with no particles present in the transmission channel, which he named counterportation. Recently [H. Salih, Quantum…
Photons are lying about where they have been, again
Gregory Reznik, Carlotta Versmold, Jan Dziewior +5
Bhati and Arvind [Phys. Lett. A, 127955 (2022)] recently argued that in a specially designed experiment the timing of photon detection events demonstrates photon presence at a loca…
Why the Many-Worlds Interpretation?
Lev Vaidman
A brief (subjective) description of the state of the art of the many-worlds interpretation of quantum mechanics (MWI) is presented. It is argued that the MWI is the only interpreta…
How the Many Worlds Interpretation brings Common Sense to Paradoxical Quantum Experiments
Kelvin J. McQueen, Lev Vaidman
The many worlds interpretation of quantum mechanics (MWI) states that the world we live in is just one among many parallel worlds. It is widely believed that because of this commit…
Three approaches for analyzing the counterfactuality of counterfactual protocols
Alon Wander, Eliahu Cohen, Lev Vaidman
Counterfactual communication protocols are analysed using three approaches: a classical argument, the weak trace criterion, and the Fisher information criterion. It is argued that…
Protective Measurement -- a new quantum measurement paradigm: detailed description of the first realisation
Enrico Rebufello, Fabrizio Piacentini, Alessio Avella +9
We present a detailed description of the experiment realising for the first time a protective measurement, a novel measurement protocol which combines weak interactions with a ``pr…
Anomalous weak values via a single photon detection
E. Rebufello, F. Piacentini, A. Avella +7
Is it possible that a measurement of a spin component of a spin-1/2 particle yields the value 100? In 1988 Aharonov, Albert and Vaidman argued that upon pre- and postselection of p…
Failed attempt to escape from the quantum pigeon conundrum
Yakir Aharonov, Shrobona Bagchi, Justin Dressel +3
A recent criticism by Kunstatter et al. [Phys. Lett. A 384, 126686 (2020)] of a quantum setup violating the pigeon counting principle [Aharonov et al. PNAS 113, 532 (2016)] is refu…
Do neutrons disagree with photons about where they have been inside an interferometer?
Lev Vaidman
Recent experiments with identically tuned nested Mach-Zehnder interferometers which attempted to observe the location of particles inside these interferometers are analyzed. In spi…
Footprints of quantum pigeons
Gregory Reznik, Shrobona Bagchi, Justin Dressel +1
We show that in the mathematical framework of the quantum theory the classical pigeonhole principle can be violated more directly than previously suggested, i.e., in a setting clos…
Measurements of nonlocal variables and demonstration of the failure of the product rule for a pre- and postselected pair of photons
Xiao-Ye Xu, Wei-Wei Pan, Qin-Qin Wang +9
We report the first implementation of the von Neumann instantaneous measurements of nonlocal variables which becomes possible due to technological achievements in creating hyperent…
Analysis of counterfactuality of counterfactual communication protocols
Lev Vaidman
Counterfactual communication, i.e., communication without particle travelling in the transmission channel, is a bizarre quantum effect. Starting from interaction-free measurements…
When photons are lying about where they have been
Lev Vaidman, Izumi Tsutsui
The past of the photon in a nested Mach-Zehnder interferometer with an inserted Dove prism is analyzed. It is argued that the Dove prism does not change the past of the photon. Alo…
Comment on "Multifold paths of neutrons in the three-beam interferometer detected by a tiny energy kick"
Lev Vaidman
An experiment with nested Mach-Zehnder interferometer [Phys. Rev. Lett. 111, 240402 (2013)] has been recently implemented with neutrons [Phys. Rev. A 97, 052111 (2018)]. Which-path…
Comment on "Past of a quantum particle revisited"
Uri Peleg, Lev Vaidman
The recent criticism of Vaidman's propsal for the analysis of the past of a particle in the nested interferometer is refuted. It is shown that the definition of the past of the par…
Modification of "Counterfactual communication protocols" which eliminates weak particle traces
Yakir Aharonov, Lev Vaidman
Possibility to communicate between spatially separated regions, without even a single photon passing between the two parties, is an amazing quantum phenomenon. The possibility of t…
Universality of local weak interactions and its application for interferometric alignment
Jan Dziewior, Lukas Knips, Demitry Farfurnik +7
The modification of the effect of interactions of a particle as a function of its pre- and postselected states is analyzed theoretically and experimentally. The universality proper…
Determining the Quantum Expectation Value by Measuring a Single Photon
F. Piacentini, A. Avella, E. Rebufello +9
Quantum mechanics, one of the keystones of modern physics, exhibits several peculiar properties, differentiating it from classical mechanics. One of the most intriguing is that var…
A Comment on "Paradox of photons disconnected trajectories being located by means of 'weak measurements' in the nested Mach-Zehnder interferometer"
Lev Vaidman
The criticism of the experiment showing discontinuous traces of photons passing through a nested Mach-Zehnder interferometer is shown to be unfounded.
Weak value controversy
Lev Vaidman
Recent controversy regarding the meaning and usefulness of weak values is reviewed. It is argued that in spite of recent statistical arguments by Ferrie and Combes, experiments wit…