An efficient and compact quantum switch for quantum circuits

Understand

The engineering of quantum devices has reached the stage where we now have small scale quantum processors containing multiple interacting qubits within them.

• Simple quantum circuits have been demonstrated and scaling up to larger numbers is underway.
• However as the number of qubits in these processors increases, it becomes challenging to implement switchable or tunable coherent coupling among them.
• The typical approach has been to detune each qubit from others or the quantum bus it connected to, but as the number of qubits increases this becomes problematic to achieve in practice due to frequency crowding issues.