Physics – Quantum Physics
Scientific paper
2011-08-25
Phys. Rev. Lett. 108, 160501 (2012)
Physics
Quantum Physics
Minor changes. Added hyperlinks in the bibliography
Scientific paper
10.1103/PhysRevLett.108.160501
So far it has been shown that the quantum dynamics cannot be described as a classical Markov process unless the number of classical states is uncountably infinite. In this paper, we present a stochastic model with time-correlated noise that exactly reproduces any unitary evolution of a qubit and requires just four classical states. The invasive updating of just one bit during a measurement accounts for the quantum violation of the Leggett-Garg inequalities. Unlike in a pilot wave theory, the stochastic forces governing the jumps among the four states do not depend on the quantum state, but only on the unitary evolution. This model is used to derive a local hidden variable model, augmented by one bit of classical communication, for simulating entangled Bell states.
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