scholarly journals When Photons Are Lying about Where They Have Been

Entropy ◽  
2018 ◽  
Vol 20 (7) ◽  
pp. 538 ◽  
Author(s):  
Lev Vaidman ◽  
Izumi Tsutsui
Keyword(s):  
Zehnder Interferometer ◽  
Experimental Demonstration ◽  
The Past ◽  
History Of ◽  
Dove Prism ◽  
Bohmian Trajectory ◽  
Mach Zehnder Interferometer

The history of photons 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. Alonso and Jordan correctly point out that an experiment by Danan et al. demonstrating the past of the photon in a nested interferometer will show different results when the Dove prism is inserted. The reason, however, is not that the past is changed, but that the experimental demonstration becomes incorrect. The explanation of a signal from the place in which the photon was (almost) not present is given. Bohmian trajectory of the photon is specified.

scholarly journals Experimental demonstrations of unconditional security in a purely classical regime

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Byoung S. Ham
Keyword(s):  
Quantum Key Distribution ◽  
Key Distribution ◽  
Unconditional Security ◽  
Zehnder Interferometer ◽  
Experimental Demonstration ◽  
Orthogonal Bases ◽  
Unitary Transformations ◽  
Mach Zehnder Interferometer

AbstractSo far, unconditional security in key distribution processes has been confined to quantum key distribution (QKD) protocols based on the no-cloning theorem of nonorthogonal bases. Recently, a completely different approach, the unconditionally secured classical key distribution (USCKD), has been proposed for unconditional security in the purely classical regime. Unlike QKD, both classical channels and orthogonal bases are key ingredients in USCKD, where unconditional security is provided by deterministic randomness via path superposition-based reversible unitary transformations in a coupled Mach–Zehnder interferometer. Here, the first experimental demonstration of the USCKD protocol is presented.

scholarly journals An Improved Experiment to Determine the ‘Past of a Particle’ in the Nested Mach–Zehnder Interferometer

2017 ◽  
Vol 34 (2) ◽  
pp. 020301 ◽  
Author(s):  
A. Ben-Israel ◽  
L. Knips ◽  
J. Dziewior ◽  
J. Meinecke ◽  
A. Danan ◽  
...  
Keyword(s):  
Zehnder Interferometer ◽  
The Past ◽  
Mach Zehnder Interferometer

scholarly journals An Ideal Experiment to Determine the ‘Past of a Particle’ in the Nested Mach-Zehnder Interferometer

2015 ◽  
Vol 32 (5) ◽  
pp. 050303 ◽  
Author(s):  
Fu Li ◽  
F. A. Hashmi ◽  
Jun-Xiang Zhang ◽  
Shi-Yao Zhu
Keyword(s):  
Zehnder Interferometer ◽  
The Past ◽  
Mach Zehnder Interferometer
Sign in / Sign up

Export Citation Format

Share Document