Can entangled photons transmit information faster than the speed of light?

[DrChinese]

So who claim (reviewed) that the order of measurements can never have meaning for an experiment?

The order of measurements on entangled particles never changes the outcome in any discernible manner. This is basic. There are no experiments saying otherwise, including those in which there is entanglement swapping.

http://arxiv.org/abs/quant-ph/0201134

P.S. Wiki is not considered a reference for matters in dispute. Neither is Scientific American, etc.

 

[UChr]

The order of measurements on entangled particles never changes the outcome in any discernible manner. This is basic. There are no experiments saying otherwise, including those in which there is entanglement swapping.

http://arxiv.org/abs/quant-ph/0201134

Although the order is indifferent in 'Entanglement swapping' - it is not trivial at 'Quantum teleportation’ - see for example:

Nicolas Gisin and Rob Thew: ‘Quantum Communication’
http://arxiv.org/PS_cache/quant-ph/pdf/0703/0703255v1.pdf

“FIG. 4: Quantum teleportation. Alice performs a BSM, a joint measurement, on the unknown qubit […] and one photon from the entangled state […]. The result does not reveal the state of the qubit but is sent to Bob who performs a result-dependent operation U to complete the teleportation.”


? Did Luiz Carlos Ry have a point in: “Comment on \Experimental Nonlocality Proof of Quantum Teleportation and Entanglement Swapping"
http://cdsweb.cern.ch/record/608852/files/0303082.pdf
- Or is he a questionable source?

 

[UChr]

Related to the possibility of obtaining interference = the need for relatively nice single-photon coherence:

In the last post mentioned Gisin + Thew: ‘Quantum Communication’: p. 5; section V:

“Consequently, some of the next steps will require detectors with improved jitter [43, 71] as well as compact sources of entangled photons with significantly increased single-photon coherence.”

- So the idea about compact sources of entangled photons with a robust single-photon coherence is not theoretically impossible.

 

[Cthugha]

- So the idea about compact sources of entangled photons with a robust single-photon coherence is not theoretically impossible.

Why do you rip short sentences out of context? Gisin is discussing the need for stabilization on the timescales of the coherence times of the light. This is a discussion about coherence times which is the kind of coherence you need if you want to see interference in a Michelson interferometer. It is not about transversal coherence length which is the kind of coherence you need in a double slit.

 

[UChr]

Why do you rip short sentences out of context? Gisin is discussing the need for stabilization on the timescales of the coherence times of the light. This is a discussion about coherence times which is the kind of coherence you need if you want to see interference in a Michelson interferometer. It is not about transversal coherence length which is the kind of coherence you need in a double slit.

A tough question - among others due
a) Zeilinger in his famous experiment with quantum teleportation using polarization.
b) Wishful thinking. It would be nice to do without coincidence counters - even something like Walborn’s experiment could test most of the idea behind my experiment.