Using a multi-layered printed circuit board, we propose a 3D architecture
suitable for packaging supercon- ducting chips, especially chips that contain
two-dimensional qubit arrays. In our proposed architecture, the center strips
of the buried coplanar waveguides protrude from the surface of a dielectric
layer as contacts. Since the contacts extend beyond the surface of the
dielectric layer, chips can simply be flip-chip packaged with on-chip
receptacles clinging to the contacts. Using this scheme, we packaged a
multi-qubit chip and per- formed single-qubit and two-qubit quantum gate
operations. The results indicate that this 3D architecture provides a promising
scheme for scalable quantum computing
We propose a scheme to simulate the interaction between a two-level system and a classical light field. Under the transversal driving of two microwave tones, the system Hamiltonian is identical to that of the general semiclassical Rabi model. We experimentally realize this Hamiltonian with a superconducting transmon qubit. By tuning the strength, phase and frequency of the two microwave driving fields, we simulate the quantum dynamics from weak to extremely strong driving regime. The resulting evolutions gradually deviate from the normal sinusoidal Rabi oscillations with increasing driving strength, in accordance with the predictions of the general semi-classical Rabi model far beyond the weak driving limit. Our scheme provides an effective approach to investigate the extremely strong interaction between a two-level system and a classical light field. Such strong interactions are usually inaccessible in experiments.
We realize the dark state in a three-dimensional transmon superconducting qutrit that consists of three cascading energy levels: |0⟩, |1⟩, and |2⟩. When the system is simultaneously driven with two tone microwaves on resonance with |0⟩, |1⟩ and |1⟩, |2⟩, respectively, it is found that the state of the system will generally evolve in time domain. However, the qutrit state is frozen-out if it is initialized in a dark state for corresponding drive amplitudes. We observe this freeze-out phenomenon by changing the amplitude of the microwaves while fixing the initial state or vice versa.
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