Perhaps make you question more precise. You may consider an entangled state of even one photon and a single photon. For instance a superposition that a photon has been absorbed by an atom exciting it or a photon went though it and atom remained in a groud state. That's the simplest example of formally entanglement state with a single atom. Add a second atom to make it even more entangled...
So please tell us: what do you exactly mean by your question and what kind of system do you consider?
Dear Chrapkiewicz, Thanks for your comment.
I am keen to understand the entanglement between two atom trapped in a single mode cavity or may be in optomechanical cavity. Atom - atom can not interact directly but can be coupled through photons. I want to start with single photon and then may be with number of photons, according to result persist. so i want to visualize the system to understand it properly. I know little bit about entanglement such as these are not product state, Alice -bob experiment, and Bell's inequality for entanglement etc. Thanks...
entanglement is a physical phenomenon that occurs when pairs or groups of particles are generated or interact in ways such that the quantum state of each particle cannot be described independently.
We can visualize this phenomena as a tossing of two coins if two coins are simultaneously by two person than the state of head or tail tossed by two person are independent. But some how if we can entangle the two coins by any means than knowing the quantum state of one coin the quantum state of the other coin can be determined. i.e. the two coins are not independent afer being entangled.
Dear Chettri, Thanks
As you have given an example of coins similar example can be of photons in horizontal and vertical states etc. But here I am looking for entanglement in two atoms with single photon or i would say spin entanglement. Atom can be of two level or three level system such as Lemda or V sysytem.
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