Before revision:  Once the optimal design is selected, the forecast is produced by a linear combination of  the average spin of a 6-qubit quantum register trained using VIX and SPX data from year 1990 onwards. We test the forecast performance over the sub-prime mortgage crisis period (Dec 2007 - Jun 2009) .
After revision:  Once the optimal design is selected, the forecast is produced by a linear combination of the average spin of the six-qubit register to predict the value of VIX at the next time step .