Reversal of the Weak Measurement of a Quantum State in a Superconducting Phase Qubit
Nadav Katz, Matthew Neeley, M. Ansmann, Radoslaw C. Bialczak, M. Hofheinz, Erik Lucero, A. O’Connell, H. Wang, A. N. Cleland, John M. Martinis, Alexander N. Korotkov
DOI 10.1103/PhysRevLett.101.200401 · Physical Review Letters
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
We demonstrate in a superconducting qubit the conditional recovery (uncollapsing) of a quantum state after a partial-collapse measurement. A weak measurement extracts information and results in a nonunitary transformation of the qubit state. However, by adding a rotation and a second partial measurement with the same strength, we erase the extracted information, canceling the effect of both measurements. The fidelity of the state recovery is measured using quantum process tomography and found to be above 70% for partial-collapse strength less than 0.6.
Similar papers
Uncollapsing of a quantum state in a superconducting phase qubit
similarity 0.91Nadav Katz et al. · 2008 · arXiv:0806.3547
Source status unknown — claims are unverified
Quantum Nondemolition Measurement of a Superconducting Qubit in the Weakly Projective Regime
similarity 0.89T. Picot et al.
Source status unknown — claims are unverified
Quantum non-demolition measurement of a superconducting two-level system
similarity 0.88A. Lupascu et al. · 2006 · arXiv:cond-mat/0611505
Source status unknown — claims are unverified
Decoherence Dynamics of Complex Photon States in a Superconducting Circuit
similarity 0.88H. Wang et al.
Source status unknown — claims are unverified
Observation of Quantum Jumps in a Superconducting Artificial Atom
similarity 0.88R. Vijay et al.
Source status unknown — claims are unverified
Compressed sensing quantum process tomography for superconducting quantum gates
similarity 0.87Andrey V. Rodionov et al.
Source status unknown — claims are unverified