Approximate simulation of entanglement with a linear cost of communication

Details Approximate simulation of entanglement with a linear cost of communication Approximate simulation of entanglement with a linear cost of communication

2011-07-23

arxiv.org/abs/1107.4647v2

Phys. Rev. A 84, 042307 (2011)

Physics

Quantum Physics

Added some clarifications. The entanglement model alternative to the Toner-Bacon model is stressed in the abstract and introdu

Scientific paper

10.1103/PhysRevA.84.042307

Bell's theorem implies that the outcomes of local measurements on two maximally entangled systems cannot be simulated without classical communication between the parties. The communication cost is finite for n Bell states, but it grows exponentially in n. Three simple protocols are presented that provide approximate simulations for low-dimensional entangled systems and require a linearly growing amount of communication. We have tested them by performing some simulations for a family of measurements. The maximal error is less than 1% in three dimensions and grows sublinearly with the number of entangled bits in the range numerically tested. One protocol is the multidimensional generalization of the exact Toner-Bacon [Phys. Rev. Lett. 91, 187904 (2003)] model for a single Bell state. The other two protocols are generalizations of an alternative exact model, which we derive from the Kochen-Specker [J. Math. Mech. 17, 59 (1967)] scheme for simulating single-qubit measurements. These protocols can give some indication for finding optimal one-way communication protocols that classically simulate entanglement and quantum channels. Furthermore they can be useful for deciding if a quantum communication protocol provides an advantage on classical protocols.

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