Comment on "Past of a quantum particle revisited"

Abstract

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 particle adopted by Englert et al. [Phys. Rev. A 96, 022126 (2017)] is applicable only to a tiny fraction of photons in the interferometer which indeed exhibit different behaviour. Their proof that all pre- and postselected particles behave this way, i.e. follow a continuous trajectory, does not hold, because it relies on the assumption that it is intended to prove.

arXiv commentComment on quant-ph 1704.03722

References in corpus (25)

• The past of a quantum particle
• Particle Path Through a Nested Mach-Zehnder Interferometer
• Tracing the past of a quantum particle
• Past of a quantum particle: Common sense prevails
• The Case of the Disappearing (and Re-Appearing) Particle
• Can a Dove prism change the past of a single photon?
• Knowing "where the photons have been"
• Null weak values and the past of a quantum particle
• Comment on "Asking Photons Where Have They Been"
• Experimental observation of anomalous trajectories of single photons
• Multifold paths of neutrons in the three-beam interferometer detected by tiny energy-kick
• Comment on "Which-way information in a nested Mach-Zehnder interferometer"
• Comment on "One-state vector formalism for the evolution of a quantum state through nested Mach-Zehnder interferometers"
• When photons are lying about where they have been
• Paradox of Photons Disconnected Trajectories Being Located by Means of "Weak Measurements" in the Nested Mach-Zehnder Interferometer
• Comment on the MS "Null weak values and the past of quantum particle" by Q.Duprey and A.Matzkin
• An Improved Experiment to Determine the `Past of a Particle' in the Nested Mach-Zehnder Interferometer
• Comment on "Particle Path Through a Nested Mach-Zehnder Interferometer"
• Past of a particle in an entangled state
• A Comment on "Paradox of photons disconnected trajectories being located by means of 'weak measurements' in the nested Mach-Zehnder interferometer"
• Reply to Comment on "Null weak values and the past of a quantum particle" by D. Sokolovski
• Unambiguous path discrimination in a two-path interferometer
• Response to the Comment on "Paradox of Photons Disconnected Trajectories Being Located by Means of "Weak Measurements" in the Nested Mach-Zehnder Interferometer" (JETP Letters 105, 152 (2017))
• Reply to L.Vaidman's comment on "Asking photons where they have been in plain language"
• A Comment on "Asking photons where they have been in plain language"

Cited by in corpus (15)

• Analysis of counterfactuality of counterfactual communication protocols
• How Quantum is Quantum Counterfactual Communication?
• When photons are lying about where they have been
• Weak values and the past of a quantum particle
• The Weak Reality that Makes Quantum Phenomena more Natural: Novel Insights and Experiments
• Reply to "Comment on `Past of a quantum particle revisited' "
• From Counterportation to Local Wormholes
• Three approaches for analyzing the counterfactuality of counterfactual protocols
• A possible solution to the which-way problem of quantum interference
• Comment on "Multifold paths of neutrons in the three-beam interferometer detected by a tiny energy kick"
• Separating a particle's mass from its momentum
• Time-symmetry and topology of the Aharonov-Bohm effect
• Interplay between strong and weak measurement: Comparison of three experimental approaches to weak value estimation
• Reply to Comment on "Multitime Quantum Communication: Interesting But Not Counterfactual" by L. Vaidman
• Do neutrons disagree with photons about where they have been inside an interferometer?