Nature Physics 11, 393–397 (2015); published online 6 April 2015; corrected after print 3 September 2015.
The version of this Letter originally published contained an error in the interpretation of the system noise floor resulting from lock-in amplifier filtering. Accordingly, Figs 4 and 5 (below) and the corresponding magnetic field sensitivity in the text have now been corrected in the online versions of the Letter.
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