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Flux qubit readout of TRANSMON qubits

A quantum bit, flux technology, applied in quantum computers, computing, instruments, etc., can solve problems such as hindering the realization of large-scale quantum computing

Pending Publication Date: 2022-07-08
GOOGLE LLC
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Multiple challenges in the design and implementation of quantum architectures that control, program, and maintain quantum hardware hinder the realization of large-scale quantum computing

Method used

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  • Flux qubit readout of TRANSMON qubits
  • Flux qubit readout of TRANSMON qubits
  • Flux qubit readout of TRANSMON qubits

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Embodiment Construction

[0051] Quantum computing requires coherent processing of quantum information stored in a quantum computer's quantum bits (qubits). Superconducting quantum computing is a promising implementation of solid-state quantum computing technology, in which quantum information processing systems are formed in part from superconducting materials. In order to operate a quantum information processing system employing solid-state quantum computing techniques, such as superconducting qubits, the system is maintained at extremely low temperatures, eg, tens of mK. The extreme cooling of the system keeps the superconducting material below its critical temperature and helps avoid unwanted state transitions. To maintain such low temperatures, quantum information processing systems may operate in cryostats, such as dilution refrigerators.

[0052] In some cases, large-scale quantum computers can be implemented using transmon qubits or variants thereof. Transmon qubits include large capacitors i...

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Abstract

A detector for reading out qubit states includes a flux qubit and a flux bias generator. The flux qubit includes an inductor and a SQUID ring, wherein the flux qubit is arranged to assume a first flux state and a second flux state. The flux bias generator generates a first flux bias through the inductor and a second flux bias through the SQUID ring such that the energies of the first flux state and the second flux state are substantially the same in response to a first value of the first flux bias and the energies of the second flux state are substantially the same in response to a second value of the first flux bias. The energies of the first flux state and the second flux state are different. The flux qubit is coupled to the qubit in response to a first value of a second flux bias, and is decoupled from the qubit and inhibits tunneling in response to a second value of the second flux bias.

Description

technical field [0001] This topic deals with readout schemes for transmon qubits. Background technique [0002] Large quantum computers have the potential to provide fast solutions to certain classes of difficult problems. Multiple challenges in the design and implementation of quantum architectures that control, program, and sustain quantum hardware hinder the realization of large-scale quantum computing. SUMMARY OF THE INVENTION [0003] This disclosure describes techniques for implementing readout schemes for transmon qubits. [0004] In general, one innovative aspect of the presently disclosed subject matter can be embodied in a detector for reading out the state of a qubit, the detector including a flux qubit and a flux bias A generator, wherein the flux qubits include an inductor, a SQUID loop including at least one Josephson junction, and a capacitor, wherein the inductor, the at least one Josephson junction, and the capacitor are connected in parallel with each o...

Claims

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Application Information

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IPC IPC(8): G06N10/00
CPCG06N10/40
Inventor D.T.赞ċ…‹
Owner GOOGLE LLC