Coldquanta, Inc.

Matthew Ebert

Martin Tom Lichtman

Mark Saffman

Thomas William Noel

Clifton Leon Anderson

Quantum computing results can be stored in a quantum array of quantum-state carriers (QSCs) which must be read out in a form accessible to the classical world. The quantum array can be divided into regions that can be read in parallel. Each region is illuminated one QSC (e.g., atom) at a time and any resulting emissions are detected to determine the quantum state of each QSC and thus the value represented by the QSC. Multi-pixel superpixels are examined in each detection image to determine whether or not a respective QSC emitted in response to illumination. The field of view for each superpixel exceeds the area of the respective QSC, providing tolerance for misalignment of the photodetector relative to the quantum array.

Time-multiplexed superpixel-based quantum-array readout system

A quantum register can be read out using under-resolved emissions mapping (e.g., imaging). Regions of the quantum register are illuminated concurrently, one array site per region at a time, typically until all sites of each region have been illuminated. A photodetector system then detects for each region whether or not an EMR emission (e.g., due to fluorescence) has occurred in response to illumination of a respective site in that region. The result of the photo detections is a series of emissions maps, e.g., images. The number of emissions maps in the series corresponds to a number of sites per region, while the number of pixels in each image corresponds to a number of regions. A readout result can be based on a time-multiplexed combination of these emissions maps. The emissions maps are under-resolved since the resolution corresponds to the region size rather than the sizes of individual array sites.

Under-resolved quantum-array state mapping

In the context of gate-model quantum computing, atoms (or polyatomic molecules) are excited to respective Rydberg states to foster intra-gate interactions. Rydberg states with relatively high principal quantum numbers are used for relatively distant intra-gate interactions and require relatively great inter-gate separations to avoid error-inducing inter-gate interactions. Rydberg states with relatively low principal quantum numbers can be used for intra-gate interactions over relatively short intra-gate distances and require relatively small inter-gate separations to avoid error-inducing inter-gate interactions. The relatively small inter-gate separations provide opportunities for parallel gate executions, which, in turn, can provide for faster execution of the quantum circuit constituted by the gates. By using Rydberg states with relatively high principal quantum numbers where required, and Rydberg states with relatively low principal quantum numbers where possible, an optimal tradeoff between intra-gate interaction flexibility and inter-gate parallelism can be achieved.

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Madison, WI, United States of America

Matthew Ebert