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Manipulating a qubit through the backaction of sequential partial measurements and real-time feedback

TitleManipulating a qubit through the backaction of sequential partial measurements and real-time feedback
Publication TypeJournal Article
Year of Publication2014
AuthorsBlok, MS, Bonato, C, Markham, ML, Twitchen, DJ, Dobrovitski, VV, Hanson, R
JournalNature Physics
Volume10
Pagination189-193
Date Published03
Type of ArticleArticle
ISBN Number1745-2473
Accession NumberWOS:000332185900013
Keywordsentanglement, quantum feedback, spins
Abstract

ment the partial measurement via tunable correlation with an electron ancilla qubit and subsequent ancilla readout(7,8). We vary the measurement strength to observe controlled wavefunction collapse and find post-selected quantum weak values(8-10). By combining a novel quantum non-demolition readout on the ancilla with real-time adaptation of the measurement strength we realize steering of the nuclear spin to a target state by measurements alone. Besides being of fundamental interest, adaptive measurements can improve metrology applications(11-13) and are key to measurement-based quantum computing(14,15).

DOI10.1038/nphys2881
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Nanoscale and Ultrafast

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