Photon vs other fundamental particles - decoherence

1. Dec 25, 2013

San K

1. What (property) makes a photon less likely to decohere/(entangle with the environment) relative to other "fundamental" particles (non leptons?) such as an electron?...say during single particle interference experiment

Photon single particle interference can done without the need for a vacuum.

2 Which other "fundamental" particles can show interference (easily) without having to create a vacuum?

Last edited: Dec 25, 2013
2. Dec 25, 2013

vanhees71

Photons are interacting only electromagnetically, which is a pretty weak interaction, and the surrounding matter in our labs is (nearly) electrically neutral. So it's pretty easy to keep a photon nearly free, i.e., not undergoing interactions with surrounding matter.

3. Dec 25, 2013

San K

Thanks vanhees.

So besides electromagnetic what other (not so weak) interaction does an electron have? (That a photon doesn't)

When we keep a photon nearly free - is the photon assumed entangled with itself?

Last edited: Dec 25, 2013
4. Dec 25, 2013

Staff: Mentor

The photon is neutral, while the electron is charged - thus even the electromagnetic interactions of the electron are stronger.

As a practical matter, photon sources are also easier to set up and manage than electron sources.

5. Dec 26, 2013

audioloop

and/or more prone to deco/enta

spin orientation.

.

Last edited: Dec 26, 2013