Quantum non-demolition measurement of microwave photons using engineered quadratic interactions

Chunqing Deng, J. M. Gambetta, A. Lupascu

We present a quantum electrical circuit with Josephson junctions formed of two anharmonic oscillators coupled with an interaction $g{\gamma }_1^2{\gamma }_2^2$ where ${\gamma }_1$ and ${\gamma }_2$ ar…