Quantum entropy and polarization measurements of the two-photon system

Abstract

We consider the bipartite state of a two-photon polarization system and obtain the exact analytical expression for the von Neumann entropy in the particular case of a 5-parameter polarization density matrix. We investigate and graphically illustrate the dependence of the entropy on these five parameters, in particular, the existence of exotic, transition from exotic to non-exotic, and non-exotic states, where the quantum conditional entropy is negative, both positive and negative, and positive, respectively. We study the "cooling" or "heating" effect that follows from the reduced density of photon 2 when a measurement is performed on photon 1.

References in corpus (3)

• Experimental quantum teleportation
• Robust quantum network architectures and topologies for entanglement distribution
• Nonlocal control of dissipation with entangled photons

Cited by in corpus (2)

• Angular distributions and polarization correlations of the two-photon spherical states
• Entropy exchange and thermal fluctuations in the Jaynes-Cummings model