Experimental Modern and Quantum Physics for Do-It-Yourself Science Enthusiasts 

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Home Experiments Archive for category "Bell’s Inequality Test"
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EG&G SPCM-AQR-13-FC Single Photon Counting Module on eBay (no relation to seller)

I HAVE NO RELATION TO SELLER – Just passing along in case someone is interested. eBay item number 271206242864: “The EG&G (or Perkin Elmer) SPCM-AQR is a self-contained module which detects single photons of light over the wavelength range from 400 nm to 1060 nm and sensitivity which often outperforms PMTs. The option 13-FC indicates

 
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Fair Sampling Loophole Closed for Test of Violation of Bell’s Inequality

  A very interesting article by Bernhard Wittmann, Sven Ramelow, Fabian Steinlechner, Nathan K Langford, Nicolas Brunner, Howard M Wiseman, Rupert Ursin,and Anton Zeilinger, entitled “Loophole-free Einstein–Podolsky–Rosen experiment via quantum steering” appeared in the Nature’s New Journal of Physics, Volume 14, May 2012. This paper describes a Bell’s Inequality Violation experiment in which the “fair sampling”

 
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Loved the Book “How the Hippies Saved Physics” by David Kaiser

I just finished the book ”How the Hippies Saved Physics” by David Kaiser and absolutely loved! The book was fun and immensely educational regarding the seemingly unlikely seed of modern-day quantum information theory.  I must confess that when I first saw the book on the shelf at my local Barnes & Noble I dismissed it as yet another

 
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Excelitas Technologies (Perkin-Elmer) C30902SH Single-Photon Avalanche Photodiode (SPAD) used in d.i.y. SPCM

Figure 144 in the book shows the schematic diagram for our d.i.y. passively-quenched SPCM based on a Perkin-Elmer C30902S-DTC SPAD. In our circuit, the SPAD is reverse-biased through a 200kΩ resistor. This value is sufficiently large that an avalanche in the SPAD will be quenched by itself within less than a nanosecond. The pulses produced by

 
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Type I Downconversion Beta-Barium-Borate (BBO) Crystal Array for diy Entangled Photon Source

Our diy entangled-photon source, shown in the book’s Figure 142,  uses two BBO crystals that support type I down-conversion that are mounted according to a design by Paul Kwiat and his colleagues at the Los Alamos National Laboratory. The nonlinear crystal in our photon entangler comprises two 5 mm x 5 mm x 0.1 mm BBO crystals mounted face-to-face at

 
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405 nm Pump Laser for diy Entangled Photon Source

This is the 405 nm pump laser used in the circuit shown in the book’s Figure 141.   The laser is built from a Blu Ray disk burner laser diode.  We drive the laser diode with 160 mA to produce around 100 mW of 405-nm polarized light.  The laser diode is capable of producing 250 mW, but we

 
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quTools quED Entanglement Demonstrator

Image Credit: quTools quTools of München, Germany is the maker of the quED quantum entangled state demonstrator system to generate and analyze polarization entangled photons.  This system is a professionally-manufactured version of the type of entangled-photon generator used by many universities, and similar to the diy version described in Chapter 8 of our book (Figure 148). quED employs a

 
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d.i.y. Two-Channel Single-Photon and Coincidence Counter

This is an inside view of the two-channel photon and coincidence counter of the book‘s Figure 145.  It is used in the photon entanglement experiments of Chapter 8.

 
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