States may be entangled and by extension we say that the particles with these states are entangled. Entwinement is a nice word but it hides a little the basic meaning.
In the references of
Quantum entanglement between an optical photon and a solid-state spin qubit
you may find
Several recent experiments demonstrated entanglement of optical
photons with trapped
- Blinov, B. B., Moehring, D. L., Duan, L. M. & Monroe, C. Observation of entanglement between a single trapped atom and a
single photon. Nature 428, 153–157 (2004)
Volz, J. et al. Observation of entanglement of a single photon with
a trapped atom. Phys. Rev. Lett. 96, 030404 (2006)
Wilk, T., Webster, S. C., Kuhn, A. & Rempe, G. Single-atom single-photon quantum interface. Science 317, 488–490 (2007)
and atomic ensembles :
Yuan, Z.-S. et al. Experimental demonstration of a BDCZ quantum
repeater node. Nature 454, 1098–1101 (2008)
Matsukevich, D. et al. Entanglement of a photon and a collective atomic excitation. Phys. Rev. Lett. 95, 040405 (2005)
Sherson, J. F. et al. Quantum teleportation between light and matter. Nature 443, 557–560 (2006)
This kind of entwinements, following the theory, is used to stock superposed states, ie from a photon to defaults in a crystal.
Precisely, for a photon and an electron, you can read Demonstration of quantum entanglement between a single electron spin confined to an InAs quantum dot and a photon
In this letter, we report an all optical experimental demonstration of
quantum entanglement between a single electron spin confined to single
charged semiconductor quantum dot and the polarization state of a
photon spontaneously emitted from the quantum dot's excited state.