Continuous-Variable Quantum Computation in Circuit QED

Ingrid Strandberg, Fernando Quijandría, Göran Johansson

Juan José García‐Ripoll

Leo DiCarlo

Zhipeng Yang, Zhen Li, Sheng-li Ma +1 more

We propose a dissipative scheme for one-step generation of continuous-variable quadripartite cluster states in a circuit QED setup consisting of four superconducting coplanar waveguide resonators and a gap-tunable superconducting flux qubit. With external driving fields to adjust the desired qubit-resonator and resonator-resonator interactions, we show that continuous-variable quadripartite cluster states of the four resonators can be generated with the assistance of energy relaxation of the qubit. By comparison with the previous proposals, the distinct advantage of our scheme is that only one step of quantum operation is needed to realize the quantum state engineering. This makes our scheme simpler and more feasible in experiment. Our result may have useful application for implementing quantum computation in solid-state circuit QED systems.

Takaya Matsuura

Viv M. Kendon

Quantum simulation is expected to be one of the most important first applications of quantum computing. I motivate the use of continuous variable quantum computation (CVQC) for quantum simulation, and describe work investigating microwave frequency cavity QED systems as viable architectures for CVQC.