Arxiv- (11 page pdf) Bringing entanglement to the high temperature limit
We show the existence of an entangled nonequilibrium state at very high temperatures when two linearly coupled harmonic oscillators are parametrically driven and dissipate into two independent heat baths. This result has a twofold meaning: first, it fundamentally shifts the classical-quantum border to temperatures as high as our experimental ability allows us, and second, it can help increase by at least one order of magnitude the temperature at which current experimental setups are operated.
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What about room temperature experiments? That would require a very strong coupling and may cause other problems. The squeezing causes the quantum states to become more delocalised, in other words they become smeared out in space. That could be a problem if the ions end up largely outside the trap in which they are supposed to be confined.
The exciting implication is that this may provide the theoretical foundations to finally understand the role that quantum mechanics plays in living things.
In addition it is notable that the strong coupling regime has been reached between a massive mechanical microresonator and light. Furthermore, a proposal for parametrically driving the coupling between a nanomechanical resonator and a superconducting electrical resonator has been given. Thus we might well foresee that these advances could be used to measure entanglement in yet unsuspected temperature regimes in the near future, while eliminating the need for complex and costly setups to cool objects to the quantum regime
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