Partial-Measurement Backaction and Nonclassical Weak Values in a Superconducting Circuit
Artikel i vetenskaplig tidskrift, 2013

We realize indirect partial measurement of a transmon qubit in circuit quantum electrodynamics by interaction with an ancilla qubit and projective ancilla measurement with a dedicated readout resonator. Accurate control of the interaction and ancilla measurement basis allows tailoring the measurement strength and operator. The tradeoff between measurement strength and qubit backaction is characterized through the distortion of a qubit Rabi oscillation imposed by ancilla measurement in different bases. Combining partial and projective qubit measurements, we provide the solid-state demonstration of the correspondence between a nonclassical weak value and the violation of a Leggett-Garg inequality.


J. P. Groen

D. Riste

Lars Tornberg

Chalmers, Mikroteknologi och nanovetenskap, Tillämpad kvantfysik

J. Cramer

P. C. de Groot

T. Picot

Göran Johansson

Chalmers, Mikroteknologi och nanovetenskap, Tillämpad kvantfysik

L. DiCarlo

Physical Review Letters

0031-9007 (ISSN) 1079-7114 (eISSN)

Vol. 111 9 090506

Solid State Systems for Quantum Information Processing

Europeiska kommissionen (EU) (EC/FP7/248629), 2010-02-01 -- 2013-09-30.





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