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Extended quantum Maxwell demon acting over macroscopic distances | A.V. Lebedev
; G.B. Lesovik
; V.M. Vinokur
; G. Blatter
; | Date: |
13 Nov 2018 | Abstract: | A quantum Maxwell demon is a device that can lower the entropy of a quantum
system by providing it with purity. The functionality of such a quantum demon
is rooted in a quantum mechanical SWAP operation exchanging mixed and pure
states. We describe the setup and performance of a quantum Maxwell demon that
purifies an energy-isolated system from a distance. Our cQED-based design
involves two transmon qubits, where the mixed-state target qubit is purified by
a pure-state demon qubit connected via an off-resonant transmission line; this
configuration naturally generates an iSWAP gate. Although less powerful than a
full SWAP gate, we show that assuming present-day performance characteristics
of a cQED implementation, such an extended quantum Maxwell demon can purify the
target qubit over macroscopic distances on the order of meters and tolerates
elevated temperatures of the order of a few Kelvin in the transmission line. | Source: | arXiv, 1811.5349 | Services: | Forum | Review | PDF | Favorites |
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