Quantum mechanics and faster-than-light communication: Methodological considerations

1983 ◽  
Vol 78 (1) ◽  
pp. 9-20 ◽  
Author(s):  
G. C. Ghirardi ◽  
T. Weber
Keyword(s):  
Quantum Mechanics ◽  
Methodological Considerations ◽  
Faster Than Light

scholarly journals Proposal to Test a Transient Deviation from Quantum Mechanics’ Predictions for Bell’s Experiment

Entropy ◽  
2021 ◽  
Vol 23 (12) ◽  
pp. 1589
Author(s):  
Alejandro Andrés Hnilo ◽  
Monica Beatriz Agüero ◽  
Marcelo Gregorio Kovalsky
Keyword(s):  
Quantum Mechanics ◽  
Hidden Variables ◽  
Quantum Correlations ◽  
Entangled State ◽  
Particle Detection ◽  
Specific Test ◽  
Nonlinear Operators ◽  
Model Following ◽  
Proposed Model ◽  
Faster Than Light

Quantum mechanics predicts correlations between measurements performed in distant regions of a spatially spread entangled state to be higher than allowed by intuitive concepts of Locality and Realism. These high correlations forbid the use of nonlinear operators of evolution (which would be desirable for several reasons), for they may allow faster-than-light signaling. As a way out of this situation, it has been hypothesized that the high quantum correlations develop only after a time longer than L/c has elapsed (where L is the spread of the entangled state and c is the velocity of light). In shorter times, correlations compatible with Locality and Realism would be observed instead. A simple hidden variables model following this hypothesis is described. It is based on a modified Wheeler–Feynman theory of radiation. This hypothesis has not been disproved by any of the experiments performed to date. A test achievable with accessible means is proposed and described. It involves a pulsed source of entangled states and stroboscopic record of particle detection during the pulses. Data recorded in similar but incomplete optical experiments are analyzed, and found consistent with the proposed model. However, it is not claimed, in any sense, that the hypothesis has been validated. On the contrary, it is stressed that a complete, specific test is absolutely needed.

scholarly journals Superluminal Communication with Polarized Entangled Photons

2021 ◽  
Author(s):  
Vinicius Ritzmann
Keyword(s):  
Wave Function ◽  
Quantum Mechanics ◽  
Real Life ◽  
Entangled Photons ◽  
Optical Circuit ◽  
Faster Than Light

Abstract In this work, we show that Quantum Mechanics predicts that two people who share entangled polarized pairs of photons can communicate faster than light. We show this communication only occurs in one direction, from Bob to Alice. Bob can send information to Alice by measuring the polarization of his photons in different directions. Alice can find out in which direction Bob has measured his photons by measuring how much light passes through an optical circuit. We show this communication is instantaneous because it is based on the collapse of the wave function of the entangled pair, which collapse is instantaneous. We conclude that regardless of whether this method of communication works or not in practice, we have something new because if it works, we would be contradicting the Theories of Relativity, and if it does not, we would have Quantum Mechanics predicting something that does not happen in real life.

5. Mysteries of the quantum

2021 ◽  
pp. 93-109
Author(s):  
David Wallace
Keyword(s):  
Quantum Mechanics ◽  
Quantum Theory ◽  
Physical Properties ◽  
The State ◽  
Successful Theory ◽  
Modern Physics ◽  
Faster Than Light ◽  
Non Locality

This chapter introduces the central mysteries of quantum mechanics. Quantum mechanics is an enormously successful theory that lies at the heart of modern physics, but there is no agreement on how to understand it. Simple experiments with light demonstrate why: in understanding those experiments, we have to shift inconsistently back and forth between thinking of the theory as assigning indefinite, delocalized, but known properties to a system, and assigning definite, localized, but unknown properties (this is called the ‘problem of measurement’). Furthermore, when we break a system into subsystems, the state of the system is not determined by the states of the subsystem (this is called ‘entanglement’), and simple arguments seem to tell us that the physical properties of entangled subsystems can influence one another non-locally—faster than light. These three mysteries—measurement, entanglement, non-locality—need to be addressed by any attempt to make sense of quantum theory.

scholarly journals Theoretical Proof that Entangled Polarized Photons Allow Superluminal Communication

2021 ◽  
Author(s):  
Vinicius Ritzmann
Keyword(s):  
Quantum Mechanics ◽  
Quantum Particle ◽  
Real Life ◽  
Communication Technologies ◽  
The Other ◽  
Great Relevance ◽  
Almost All ◽  
Polarized Photons ◽  
The Universe ◽  
Faster Than Light

Abstract In Quantum Mechanics, two particles are entangled if their physical states depend on one another's so that if we find one of them in state A, for example, we will be sure that the other is in state B. However, until the state of a quantum particle is measured, it will be in a superposition of states, being in neither one nor the other until then, so when an entangled particle is measured, its pair also assumes a state instantly and regardless of how far away it is from the other particle at that time. As promising as it could be to use this fact for instantaneous communication, Quantum Mechanics seems to claim this is impossible, as no method ever invented to do this has worked until today. What we demonstrate here theoretically is that with a protocol and simple optical devices, two people who share polarized entangled pairs of photons can send information to each other faster than light. If this model of communication proves to be experimentally functional, we will have a contradiction to Einstein's theories of relativity, and otherwise, we will have Quantum Mechanics predicting something that does not happen in real life. This result, therefore, shows there is something fundamental about the universe we do not know yet. One of these theories must be mistaken and both deal with fundamental aspects of reality, such as the dynamics of space and time, and the particles that almost all matter around us are made of. Besides, this result is of great relevance also because it has immediate applications in several areas if the model works experimentally, as in space exploration and security, since it will allow the creation of non-interceptable instantaneous communication technologies.

COMPLEMENTARY HISTORIES AND COLLAPSE INTO THE PAST IN STANDARD QUANTUM MECHANICS

1999 ◽  
Vol 13 (20) ◽  
pp. 2629-2636
Author(s):  
YURI F. ORLOV
Keyword(s):  
Quantum Mechanics ◽  
Quantum States ◽  
Standard Quantum ◽  
Quantum Formalism ◽  
The Past ◽  
Interpretations Of Quantum Mechanics ◽  
Single State ◽  
Standard Formalism ◽  
Faster Than Light

It follows from the standard quantum formalism that in the time between any two noncommuting measurements there are two quantum states of the same system representing two complementary, forward and backward histories, histories that may be observed in two complementary experiments. It follows from this in turn that all interpretations of quantum mechanics based on the idea of a single state between measurements should be rejected. The non-existence of a faster-than-light nonlocality and of paradoxes in EPR-type experiments1 can be proved in the frame of the standard formalism when the reality of backward histories is taken into account.

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