We propose and experimentally verify a cooling limit for a quantum channel going through an incoherent environment. The environment consists of a large number of independent non-interacting and non-interfering elementary quantum systems - qubits. The qubits travelling through the channel can only be randomly replaced by environmental qubits. We investigate a conditional cooling limit that exploits an additional probing output. The limit specifies when the single-qubit channel is quantum, i.e. it preserves entanglement. It is a fundamental condition for entanglement-based quantum technology.
CITATION STYLE
Straka, I., Miková, M., Mičuda, M., Dušek, M., Ježek, M., & Filip, R. (2015). Conditional cooling limit for a quantum channel going through an incoherent environment. Scientific Reports, 5. https://doi.org/10.1038/srep16721
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