The reported combination of high coherence and strong anharmonicity of fluxoniums can be readily utilized for improving the fidelity of digital logical operations and constructing analog simulators of strongly interacting quantum spin models. Our experiment thus delivers an important lesson: Complex multijunction circuits can have superior coherence when properly designed. Yet, we conclude that even longer coherence time is likely with our design in the near future by simply upgrading our fabrication procedures to the state of the art. Having so many junctions per qubit has been generally viewed as a liability for establishing long coherence times. This leads to an exceptionally large value of the total inductance of the loop, which makes fluxonium distinct and useful. Our work significantly expands the toolbox of quantum superconducting circuits, especially in the context of scaling up quantum processors.Ī notable feature of fluxonium is that it consists of a superconducting loop interrupted by over 100 Josephson junctions, strips of insulating material a few nanometers thick sandwiched between superconducting layers. We report record long coherence-reaching 0.5 ms-in fluxonium, a relatively unexplored superconducting artificial atom with properties desirable for engineering fast, controllable interactions between qubits. A statistical study in different regimes shows the robustness of the method.The key characteristic of a superconducting quantum bit (or qubit) is coherence time, which measures how long a qubit can hold information. An experimental validation is performed using a high-harmonic source. The strategic configuration of the pinholes allows us to disentangle the degree of spatial coherence from the intensity distribution, thus removing the need for parallel measurement of the beam intensity. ], we designed a specific arrangement of a two-dimensional non-redundant array of apertures, which allows, through its far field interference pattern, for a single-shot measurement of the spatial coherence, while being robust against beam-pointing instabilities. Based on the method proposed by González et al. NET Install Oracle Coherence for C++ Version 12.2.1.4. However, current techniques require either parallel intensity measurements or the use of several masks. Single-shot characterization of the spatial coherence length of a source is thus crucial. In lensless imaging, for example, it can strongly affect the image formation, especially when the source exhibits shot-to-shot variations. Spatial coherence is an impactful source parameter in many applications ranging from atomic and molecular physics to metrology or imaging.
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