[General] Can a single indivisible photon interfere?

[Andrew Meulenberg]

Dear Francois,

I liked the inversion of Dirac's statement in your abstract of an earlier
paper (below).

"Simple alternative model of the dual nature of light and its Gedanken
experiment"  F. Henault
<https://arxiv.org/find/quant-ph/1/au:+Henault_F/0/1/0/all/0/1>

In this paper is presented a simple alternative model of the dual nature of
light, based on the deliberate inversion of the original statement from P.
A. M. Dirac: "Each photon interferes only with itself.
*Interference between different photons never occurs."*

While it makes what I feel is a needed refinement of Chandra/s
Non-Interference of Waves position, it perhaps still misses something that
Dirac might not have been aware of - the existence of identical photons.
Your use of "different" *could* preclude "identical"; however, the language
is ambiguous and it could also include separate, but identical, photons.

I would contend that identical photons (and perhaps the recently-produced,
single-wavelength, photons) could interact with one another.

Best regards,

Andrew M
_ _ _

On Tue, Sep 26, 2017 at 5:05 AM, François henault <
francois.henault at univ-grenoble-alpes.fr> wrote:

> Dear Chandra,
> About interferometric experiments, perhaps you could have a look to my
> paper "Quantum physics and the beam splitter mystery" presented in your
> SPIE conference "The Nature of Light" 2015:
>
> https://arxiv.org/abs/1509.00393
>
>
> Best Regards,
> Francois
>
>
> Le 25/09/2017 à 23:56, Roychoudhuri, Chandra a écrit :
>
> Hello Everybody: Here is a potentially new “thread” for debate for our
> community.
>
> “Can a single indivisible photon interfere?”
>
> My answer is a strong “No”.
>
>
>
> I just presented this paper at the OSA Annual meeting last week, held  at
> Washington, DC. It was well accepted by many.
>
> It is only an 11-slide presentation. However, it experimentally
> demonstrates that, for Superposition Effect to emerge, we must have the
> simultaneous presence of two physical signals carrying two physically
> different phase information incident on the opposite sides of the
> beam-combiner of a two-beam Mach-Zehnder interferometer. The superposition
> effect emerges as purely a classical effect facilitated by the dielectric
> boundary of the beam combiner (classical light-matter interaction; no QM).
> The energies in the two superposed beams can have any value, no lower limit
> like “h-nu”. Thus, single photon interference is causally and physically an
> untenable logic, in my view point.
>
>
>
> The experiment also underscores that the postulate of the “Wave-particle
> duality”, is completely unnecessary for EM waves. In fact, the Copenhagen
> Interpretation becomes more logical and causal without this postulate. The
> QM formulation is essentially correct. We do not need to degrade it by
> imposing non-causal postulates.
>
> In the past, I have also proposed an experiment to validate that for
> “particle interference”, we also need pairs of out-of-phase particles to
> nullify the stimulation of the detector molecule to generate “dark fringes”.
>
>
>
> Chandra.
>
>
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>
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