Quantum Rifling: Protecting a Qubit from Measurement Back Action

Physical Review Letters
Daniel SzombatiArkady Fedorov

Abstract

Quantum mechanics postulates that measuring the qubit's wave function results in its collapse, with the recorded discrete outcome designating the particular eigenstate that the qubit collapsed into. We show that this picture breaks down when the qubit is strongly driven during measurement. More specifically, for a fast evolving qubit the measurement returns the time-averaged expectation value of the measurement operator, erasing information about the initial state of the qubit while completely suppressing the measurement backaction. We call this regime quantum rifling, as the fast spinning of the Bloch vector protects it from deflection into either of its eigenstates. We study this phenomenon with two superconducting qubits coupled to the same probe field and demonstrate that quantum rifling allows us to measure either one of the qubits on demand while protecting the state of the other from measurement backaction. Our results allow for the implementation of selective readout multiplexing of several qubits, contributing to the efficient scaling up of quantum processors for future quantum technologies.

References

Mar 1, 1990·Physical Review. a·W M ItanoD J Wineland
Aug 26, 2003·Physical Review Letters·S A GurvitzG P Berman
Apr 20, 2004·Physical Review Letters·T M Stace, S D Barrett
Dec 31, 2005·Physical Review Letters·Andrew N Jordan, Markus Büttiker
Aug 16, 2006·Physical Review Letters·Andrew N JordanMarkus Büttiker
Feb 7, 2007·Physical Review Letters·Erik W StreedDavid E Pritchard
Apr 8, 2011·Physical Review Letters·R VijayI Siddiqi
Jan 12, 2013·Science·M HatridgeM H Devoret
Jan 31, 2013·Nature Communications·Jian LiG S Paraoanu
Dec 20, 2014·Physical Review Letters·D Andrew GolterHailin Wang
Nov 1, 2016·Nature Nanotechnology·Arne LauchtA Morello
Apr 2, 2019·Physical Review Letters·S TouzardM H Devoret
Jun 5, 2019·Nature·Z K MinevM H Devoret

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