Sending classical information through relativistic quantum channels
arXiv:1304.4607 · doi:10.1103/PhysRevA.87.042339
Abstract
We investigate how special relativity influences the transmission of classical information through quantum channels by evaluating the Holevo bound when the sender and the receiver are in (relativistic) relative motion. By using the spin degrees of freedom of spin-1/2 fermions to encode the classical information we show that, for some configurations, the accessible information in the receiver can be increased when the spin detector moves fast enough. This is possible by allowing the momentum wave packet of one of the particles to be wide enough while the momentum wave packets of other particles are kept relatively narrow. In this way, one can take advantage of the fact that boosts entangle the spin and momentum degrees of freedom of spin-1/2 fermions to increase the accessible information in the former. We close the paper with a discussion of how this relativistic quantum channel cannot in general be described by completely positive quantum maps.
10 pages, 6 figures, accepted for publication in Phys. Rev. A
References in corpus (11)
- The classical-quantum boundary for correlations: discord and related measures
- Vanishing quantum discord is necessary and sufficient for completely positive maps
- Quantum Entanglement of Moving Bodies
- Experimental verification of the feasibility of a quantum channel between Space and Earth
- Continuous variable entanglement sharing in non-inertial frames
- Hawking radiation, Entanglement and Teleportation in background of an asymptotically flat static black hole
- Redistribution of particle and anti-particle entanglement in non-inertial frames
- Vanishing quantum discord is not necessary for completely-positive maps
- Residual entanglement of accelerated fermions is not nonlocal
- How state preparation can affect a quantum experiment: Quantum process tomography for open systems
- Information gap for classical and quantum communication in a Schwarzschild spacetime