Quantum correlations with spacelike separated beam splitters in motion: experimental test of multisimultaneity.
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Citations
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Bibliographic guide to the foundations of quantum mechanics and quantum information
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References
On the Einstein-Podolsky-Rosen paradox
A suggested interpretation of the quantum theory in terms of "hidden" variables. ii
Speakable and Unspeakable in Quatum Mechanics
Experimental Test of Bell's Inequalities Using Time- Varying Analyzers
Quantum information and computation
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Frequently Asked Questions (10)
Q2. Why is the distance between the interferometers sufficient?
Because of the high speed of the acoustic wave (2500 m s, specified by the manufacturer and computed from the mechanical properties of amorphous material transmitting IR [19]), a distance of 55 m between the interferometers is sufficient, allowing us to realize the experiment inside their building.
Q3. What is the criterion for the change in time ordering of two events in two reference?
The criterion given by special relativity for the change in time ordering of two events in two reference frames counterpropagating at speed y isjDtj , y c2 d , (4)where Dt and d are, respectively, the time difference and distance between the two events in the laboratory frame [3].
Q4. What is the frequency shift of the reflected light?
Within an AOM the reflected light is also frequency shifted and the frequency shift is equal to the acoustic wave frequency (100 MHz in their case):Dn ns .
Q5. How do the authors collect the light coming out of the input port?
Because of the small deviation angle (about 5±) of the interferometer arms, the authors collect only the light coming out from the input port by using a fiber optical circulator (see Fig. 1).
Q6. What is the simplest way to describe quantum correlations?
Within Newtonian physics, where time is absolute, it is possible to describe quantum correlations at a distance in a causal time-ordered way [5].
Q7. What is the coincidence rate between the two outputs?
If the authors select only those events, the coincidence rate between the two outputs is proportional towhere V is the visibility and f1 and f2 are the phase differences between the long and the short arms in interferometers 1 and 2, respectively.
Q8. How can the authors fix the speed of a quantum influence?
The authors can add that given the distance and the uncertainty on the time of arrival, the authors can fix a lower bound of the speed in the laboratory frame of any hypothetical quantum influence to be 4.6 3 105c.
Q9. What is the reflection coefficient of the beam splitter?
The reflection coefficient is maximal at the Bragg angle uB:2ls sinuB l n , (1) where ls is the sound wavelength, l is the light wavelength in vacuum, and n the refractive index of the material.
Q10. What is the reflection coefficient of the Michelson AOM?
The reflection coefficient is given by R sin2 p aI [17], where The authoris the acoustic power and a depends on the AOM size and material, and on the light wavelength.