Archive for Entanglement

New Publication at the Open Journal of Astrophysics

Posted in OJAp Papers, Open Access, The Universe and Stuff with tags , , , , , on November 4, 2022 by telescoper

It’s time once again for me to announce new paper at the Open Journal of Astrophysics. The new paper, published last week, is the 15th paper in Volume 5 (2022) and the 63rd in all. The latest publication is entitled “Two-photon amplitude interferometry for precision astrometry” and the authors are Paul Stankus, Andrei Nomerotski and Anže Slosar of Brookhaven National Laboratory (USA) and Stephen Vintskevich (Moscow Institute of Physics & Technology, Russia).

The paper presents a new method for doing interferometry with quantum-mechanically entangled photons and is thus is in the folder marked Instrumentation and Methods for Astrophysics. I don’t know much about this area – and there are many whose baseline opinion is that interferometry is a bit of a fringe topic that is rather complex perhaps needs more visibility in the current phase of its development  (geddit?) – but the physics looks fascinating to me. Amplitude interferometry should be contrasted with the intensity interferometry method of Hanbury Brown and Twiss which I remember learning about as an undergraduate.

Anyway, here is a screen grab of the overlay which includes the  abstract:

You can click on the image to make it larger should you wish to do so. The full image used in the overlay is this:

 

You can find the officially accepted version of the paper on the arXiv here.

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Jazz and Quantum Entanglement

Posted in Jazz, The Universe and Stuff with tags , , , , , on May 28, 2015 by telescoper

As regular readers of this blog (Sid and Doris Bonkers) will know, among the various things I write about apart from The Universe and Stuff is my love of Jazz. I don’t often get the chance to combine music with physics in a post so I’m indebted to George Ellis for drawing my attention to this fascinating little video showing a visualisation of the effects of quantum entanglement:

The experiment shown involves pairs of entangled photons. Here is an excerpt from the blurb on Youtube:

The video shows images of single photon patterns, recorded with a triggered intensified CCD camera, where the influence of a measurement of one photon on its entangled partner photon is imaged in real time. In our experiment the immediate change of the monitored mode pattern is a result of the polarization measurement on the distant partner photon.

You can find out more by clicking through to the Youtube page.

While most of my colleagues were completely absorbed by the pictures, I was fascinated by the choice of musical accompaniment. It is in fact Blue Piano Stomp, a wonderful example of classic Jazz from the 1920s featuring the great Johnny Dodds on clarinet (who also wrote the tune) and the great Lil Armstrong (née Hardin) on piano, who just happened to be the first wife of a trumpet player by the name of Louis Armstrong.

So at last I’ve found an example of Jazz entangled with Physics!

P.S. We often bemoan the shortage of female physicists, but Jazz is another field in which women are under-represented and insufficiently celebrated. Lil Hardin was a great piano player and deserves to be much more widely appreciated for her contribution to Jazz history.

 

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