Physics

A qubit keeping cool in a hot environment

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Science  14 Aug 2015:
Vol. 349, Issue 6249, pp. 702-703
DOI: 10.1126/science.349.6249.702-d

Interactions with a hot environment can cause a qubit—the building block of a quantum computer—to lose the information it is encoding. Now, Bahri et al. show theoretically that adding disorder and topology to the mix can save the day. The authors studied a chain of disordered, interacting spins with topologically protected edge states. The disorder in the chain caused the bulk to become localized. As a consequence, the two edge spins—which acted like qubits—effectively decoupled from the hot bulk. The calculations predicted that such a qubit would retain its information content over a period that grows with the system size.

Nat. Commun. 10.1038/ncomms8341 (2015).

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