Bringing Entanglement to the High Temperature Limit

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Abstract
Decoherence due to contact with a hot environment typically restricts quantum phenomena to the low temperature limit, kBT/$\hbar${}$\omega${}$\ll${}1 ($\hbar${}$\omega${} is the typical energy of the system). Here we report the existence of a nonequilibrium state for two coupled, parametrically driven, dissipative harmonic oscillators which, contrary to generalized intuition, has stationary entanglement at high temperatures. This clarifies the role of temperature and could lighten the burden on quantum experiments requiring delicate precooling setups.

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