1 May 2014 Recovery of qubit coherence by noise-eater technique
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We propose a quantum noise eater for a single qubit and experimentally verify its performance for recovery of a superposition carried by a dual-rail photonic qubit. We consider a case when only one of the rails (e.g., one of interferometric arms) is vulnerable to noise. A coherent but randomly arriving photon penetrating into this single rail causes a change of its state, which results in an error in a subsequent quantum information processing. We theoretically prove and experimentally demonstrate a conditional full recovery of the superposition by this quantum noise eater.
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Miroslav Gavenda, Miroslav Gavenda, Lucie Čelechovská, Lucie Čelechovská, Miloslav Dušek, Miloslav Dušek, Radim Filip, Radim Filip, "Recovery of qubit coherence by noise-eater technique", Proc. SPIE 9136, Nonlinear Optics and Its Applications VIII; and Quantum Optics III, 91362E (1 May 2014); doi: 10.1117/12.2052419; https://doi.org/10.1117/12.2052419


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