TY  - JOUR
AU  - Criger, Ben
AU  - Ciani, Alessandro
AU  - DiVincenzo, David
TI  - Multi-Qubit Joint Measurements in Circuit QED: Stochastic Master Equation Analysis
JO  - EPJ Quantum Technology
VL  - 3
IS  - 1
SN  - 2196-0763
CY  - Berlin
PB  - Springer Open
M1  - FZJ-2016-06930
SP  - 6
PY  - 2016
AB  - We derive a family of stochastic master equations describing homodyne measurement of multi-qubit diagonal observables in circuit quantum electrodynamics. Our approach replaces the polaron-like transformation of previous work, which required a lengthy calculation for the physically interesting case of three qubits and two resonator modes. The technique introduced here makes this calculation straightforward and manifestly correct. Using this technique, we are able to show that registers larger than one qubit evolve under a non-Markovian master equation. We perform numerical simulations of the three-qubit, two-mode case from previous work, obtaining an average post-measurement state fidelity near 94%.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000407193900001
DO  - DOI:10.1140/epjqt/s40507-016-0044-6
UR  - https://juser.fz-juelich.de/record/824321
ER  -