Available Technology

Isotopically Pure Materials For Ultra-low Noise Cryogenic Devices and Q-bits

The performance of many ultra-low noise electronic devices such as SQUIDs, photon detectors, single-electron transistors or Q-bits is often limited by non-thermal noise of unknown origin. It is generally believed that this noise and decoherence in Q-bits is caused by the presence of low energy states in materials, often referred as two-level systems, while “fluctuators “ would be more appropriate term. These localized objects can undergo translational changes , like change of coordinates or spatial distribution (like atom “jumping” in between two close quasi-equilibrium positions or localized electrons), or orientational changes (rotators, like spins of localized electrons or nuclear spins). Fluctuators have different channels to interact with each other and to interfere with device operation.
Patent Abstract: 
This invention suggests to reduce the noise in Q-bits and other low-noise electronic and superconducting devises devices by synthesizing special materials where several classes of fluctuators (two-level systems) are excluded (or, their number is substantially reduced) both in the volume of materials and on the boundaries and interfaces. This invention also suggests materials with low number of disorder and internal degrees of freedom, or number of internal states in the material accessible at low temperatures.
Internal Laboratory Ref #: 
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