Multi-mode qubit readout and qubit state assignment

Abstract

Systems, computer-implemented methods, and computer program products to facilitate external port measurement of qubit port responses are provided. According to an embodiment, a system can comprise a memory that stores computer executable components and a processor that executes the computer executable components stored in the memory. The computer executable components can comprise an analysis component that can analyze responses of a multi-mode readout device coupled to a qubit. The computer executable components can further comprise an assignment component that can assign a readout state of the qubit based on the responses. In some embodiments, the multi-mode readout device can be electrically coupled to at least one of the qubit or an environment of the qubit based on a defined electrical coupling value.

Description

technical field [0001] The present invention relates to superconducting quantum circuits, and more particularly, to multi-mode qubit readout and qubit state assignment. Background technique [0002] Quantum computing typically uses quantum mechanical phenomena in order to perform computational and information processing functions. Quantum computing can be contrasted with classical computing, which typically uses transistors to operate on binary values. That is, classical computers can operate on bit values ​​of 0 or 1, but quantum computers operating on qubits that contain a superposition of 0s and 1s can entangle multiple quantum bits (qubits), and use interference. [0003] Quantum computing hardware is different from classical computing hardware. In particular, superconducting quantum circuits often rely on Josephson junctions that can be fabricated on semiconductor substrates. Josephson junctions generally exhibit the supercurrent Josephson effect, in which current ca...

AI Technical Summary

Problems solved by technology

These filters can be bulky and are often accompanied by design-manufacturing constraints that can limit the dynamic control of each readout resonator

[0005] Additionally, the large coupling of the readout resonator to the environment enables fast, high-fidelity qubit state assignment, making the system extremely sensitive to noise at the resonator frequency, which compromises the coherence of the qubit and thus its coherence time

Purcell filters only protect qubits from attenuation, but not resonators from phase shift noise

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