Method for Reading Out the States of Multiple Qubits, in Particular Superconducting Qubits, Readout Device and Quantum Computer

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This invention describes a method and a device for reading out the states of multiple quantum bits (qubits), particularly superconducting qubits like flux qubits, which are essential components in quantum computers. The technique involves using a single probe signal delivered via a shared line to all qubits, but assigns each qubit its own response circuit (preferably a response resonator). The system is designed so that the response signals from individual qubits are delayed with respect to each other, allowing for more effective and simultaneous state detection.

Use CasesContent extracted from patent full text and abstract with AI.

• State detection in quantum computers with multiple qubits
• Efficient readout systems for superconducting or flux qubit arrays
• Improved measurement systems for quantum research laboratories
• Quantum processors requiring reliable and scalable qubit monitoring

BenefitsContent extracted from patent full text and abstract with AI.

• Enables simultaneous or sequential readout of multiple qubits with a single probe signal
• Reduces circuit complexity by using shared probe lines
• Improves scalability for larger quantum processors with many qubits
• Minimizes crosstalk and interference between qubit readouts by delaying response signals
• Facilitates more efficient and accurate quantum computations and experiments

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Patent Abstract

The invention relates to a method for reading out the states of a plurality of qubits (Q1-Qn), in particular superconducting qubits, preferably flux qubits, wherein the qubits (Q1-Qn) are supplied with the same sample signal (7) via a common sample line (8) for reading out the states, and wherein each qubit (Q1-Qn) is assigned its own response circuit (5), preferably having a response resonator (4), and wherein in response to the supplied sample signal (7), a response signal (20) is output via the respective response circuit (5) containing information about the state of the respective qubit (Q1-Qn), wherein the response signal (20) of at least one qubit (Q1-Qn) is delayed relative to the response signal (20) of at least one further qubit (Q1-Qn).