Readout Device and Method for Time-Multiplexed Readout of Multiple Quantum Devices, in Particular Quantum Dots or Quantum Bits, and Quantum Device

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The invention concerns a reading apparatus and method for the delayed (time-shifted) readout of multiple quantum devices, such as quantum dots or qubits, particularly in quantum computers. It utilizes an arrangement of sample-and-hold modules, each capable of storing quantum state information from a respective quantum device. These stored values can then be sequentially transferred to a comparator for analysis, even outside the coherence time of the quantum devices. This allows for faster, scalable, and more reliable digital readout of many quantum bits simultaneously without being limited by quantum coherence times.

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• Readout architecture for large-scale quantum computers using spin-based or semiconductor-based quantum bits (qubits).
• Integration into quantum computing chips and control systems that require reliable, scalable measurement of many qubit states.
• Upgrade or replacement for readout electronics in research or commercial quantum processors to enhance throughput and reduce errors.
• Time-multiplexed quantum state measurement systems in low-temperature (cryogenic) environments.
• Development of more energy- and space-efficient quantum device readout modules.

BenefitsContent extracted from patent full text and abstract with AI.

• Enables simultaneous acquisition and delayed, sequential processing of quantum state information, removing the constraint of readout within the short coherence times of qubits.
• Reduces hardware complexity and physical size of the readout electronics, supporting greater qubit density and scalability of quantum processors.
• Improves measurement reliability and error performance by leveraging stored reference and measurement values and high-sensitivity comparators.
• Allows for new quantum operations to begin before the previous batch of measurements has been fully processed, increasing computational throughput.
• Suited for challenging cryogenic operating environments and compatible with advanced quantum bit (qubit) array layouts, such as 'spider-web' arrays.
• Minimizes power consumption and wiring complexity compared to traditional frequency- or time-multiplexing approaches.

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Patent Abstract

The present invention relates to a reading apparatus (4) for the delayed reading of a plurality of quantum devices (2), comprising - a plurality of sample and hold modules (5), wherein each of the sample and hold modules (5) is or can be connected to at least one quantum device (2), and wherein each of the sample and hold modules (5) comprises at least two sample and hold elements (6, 7), - at least two global trigger lines, - at least one global comparator (8), - at least two global transmission lines (9, 10) which can be used to transmit quantum state values held in the sample and hold elements (6, 7) of the associated sample and hold modules (5) to the global comparator (8), and - activation means which are assigned to the sample and hold elements (6, 7) of the sample and hold modules (5) and are designed and/or configured such that quantum state values held by the sample and hold elements (6, 7) of the sample and hold modules (5) can be sequentially transmitted to the global comparator (8) in a module-by-module manner.