Marty Green

819 reputation

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bio	website	marty-green.blogspot.com
	location	Canada
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visits	member for	2 years, 1 month
	seen	May 17 at 18:53
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	819 reputation	bio	website	marty-green.blogspot.com	visits	member for	2 years, 1 month
310 badges		location	Canada		seen	May 17 at 18:53

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Jul 17	comment	Coincidence detectors in Bell tests: How close is close enough? to clarify my problem: to ballpark the statistics, I take the reported 380,000 Alice events (approx. 40,000 per second) and find them to be spaced on average 25000 nseconds apart. Let's call them dark counts for sake of argument. Then I ask: how often will two adjacent dark counts occur 2.5 nseconds apart? You can see there is a factor of 10,000 here, which leads to an estimate of around 4 dark count coincidences per second. But from the graph I need to justify close to 200 coincidences outside the 1-nanosecond band. So what are they?
Jul 17	comment	Coincidence detectors in Bell tests: How close is close enough? @bjorn well that's my problem. I'm trying to reconcile the total number of Alice events (388860 over 10 seconds) with the observed frequency of counts within the 3-nsec window. If I assume everything outside the 1 n-sec band is due to dark counts, then assuming Poisson there should be close to 4,000,000 Alice events over the 10-second interval. (By my ballpark estimate: I count about 200 events per second between the 1 nsec and 3 nsec band.) So I have a discrepancy of a factor of 10 in understanding the data as presented.
Jul 17	comment	Coincidence detectors in Bell tests: How close is close enough? Point well taken. But you do see what I mean about two overlapping data sets, I hope? The density of events outside the 1-nanosecond band is just too steady to be the tail of a pure Poisson. If not ordinary photons, can I speculate that the entangled photons come in two varieties: singlet and triplet state? Perhaps the triplet state photons have narrower transition bandwidth so they are coherent over a longer time frame?
Jul 17	comment	Coincidence detectors in Bell tests: How close is close enough? Thanks, Peter. Excellent answer, and I'm especially gratified that you weren't put off by my zero "acceptance rate", which is of course now no longer zero. However, the data raises a new question for me: one would like to understand the scatter of points as the overlay of two types of data: entangled and ordinary photons, with each subset of photons governed by its own Poisson statistics. However, a rough count of events within the 3 nanosecond band seems to show about 200 "ordinary" photons per second, and I can't seem to line this up with the expected Poisson numbers...
Jul 16	awarded	Scholar
Jul 16	accepted	Coincidence detectors in Bell tests: How close is close enough?
Jul 16	asked	Coincidence detectors in Bell tests: How close is close enough?
Jul 16	answered	Quantum entanglement vs classical analogy
Jul 3	revised	What really cause light/photons to appear slower in media? added 124 characters in body
Jul 3	answered	What really cause light/photons to appear slower in media?
Jun 28	comment	How is thermodynamic entropy defined? What is its relationship to information entropy? I think there's also a further argument to be made about the arbitrary cell size chosen in phase space when counting energy states. Is it not true at least to an approximation that using a smaller cell size changes the entropy by only an additive constant? So changes in entropy are independent of the choice of cell size?
Jun 8	answered	Common false beliefs in Physics
Jun 5	comment	Intrigued about a polarizer effect amazing explanation. but what kind of diabolical people would sell you a filter like that?
Jun 5	awarded	Enthusiast
Jun 4	comment	What is the shape of a clamped bent bar? I can't exactly explain it, but I can point out that in the beam equation, for a uniform cross-section the force distribution is the second derivative of the curvature. So wherever there are no forces the chance in curvature can be at most linear.
Jun 4	answered	Is there any thing other than time that “triggers” a radioactive atom to decay?
Jun 1	revised	Does decoherence explain all instances of wave function collapse? added 1007 characters in body
Jun 1	answered	Particles, waves and parallel wire filters. Transmission formula?
Jun 1	comment	Particles, waves and parallel wire filters. Transmission formula? @Bjorn I'm going to give an alternative answer for the transmitting case, since you've argued for linear transition as the strips get thinner. And I think it would be a shame if we ended up relying on toolboxes to think for us.
May 31	comment	Particles, waves and parallel wire filters. Transmission formula? Re my last comment: at any rate, the calculations I've done are based on the assumption that the grid period is much smaller than the wavelength and the total grid diameter is much larger than the wavelength.