Observation of quantum oscillations between a Josephson phase qubit and a microscopic resonator using fast readout.
We have detected coherent quantum oscillations between Josephson phase qubits and critical-current fluctuators by implementing a new state readout technique that is an order of magnitude faster than previous methods. These results reveal a new aspect of the quantum behavior of Josephson junctions, and they demonstrate the means to measure two-qubit interactions in the time domain. The junction-fluctuator interaction also points to a possible mechanism for decoherence and reduced fidelity in superconducting qubits.
Cooper
K B
KB
National Institute of Standards and Technology, 325 Broadway, Boulder, CO 80305, USA.
Steffen
Matthias
M
McDermott
R
R
Simmonds
R W
RW
Oh
Seongshik
S
Hite
D A
DA
Pappas
D P
DP
Martinis
John M
JM