Entangled spin states in geodesic motion around massive body

  • Authors:

  • Fatemeh Ahmadi;Mohammad Mehrafarin

  • Affiliations:

  • Physics Department, Amirkabir University of Technology, Tehran, Iran 15914;Physics Department, Amirkabir University of Technology, Tehran, Iran 15914

  • Venue:
  • Quantum Information Processing
  • Year:
  • 2014

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Abstract

We discuss the effect of the gravitational field of a massive body on the spin entanglement of a two-qubit system in the singlet and triplet spin states in circular geodesic motion. We study the entanglement transport using Wootters concurrence, which depends on the momentum state of the system. We describe the behavior of the concurrence as a function of the orbital radius and show that the spin entanglement is more robust against changes caused by motion in the singlet state than in the triplet state. Furthermore, for the singlet (triplet) state, momentum correlation increases (decreases) the concurrence.