Physical implementations of qubits can be extremely sensitive toenvironmental coupling, which can result in decoherence. While efforts are madefor protection, coupling to the environment is necessary to measure andmanipulate the state of the qubit. As such, the goal of having long qubitenergy relaxation times is in competition with that of achieving high-fidelityqubit control and measurement. Here we propose a method that integratesfiltering techniques for preserving superconducting qubit lifetimes togetherwith the dispersive coupling of the qubit to a microwave resonator for controland measurement. The result is a compact circuit that protects qubits fromspontaneous loss to the environment, while also retaining the ability toperform fast, high-fidelity readout. Importantly, we show the device operatesin a regime that is attainable with current experimental parameters and providea specific example for superconducting qubits in circuit quantumelectrodynamics.
展开▼
