Parametric Qubit Coupler Junction for Fewer Swap Gates
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Solution Overview
Problem
In quantum computing systems, it is challenging to couple qubits over long distances without affecting the quality of qubit measurements and the state of adjacent qubits, especially as quantum computing devices expand in size and quantity, leading to limitations in qubit connectivity and increased error rates due to the need for additional gate operations and decoherence.
Innovation Solution
The implementation of a system with tunable couplers and a junction that allows for all-to-all connectivity between qubits, enabling parametric gate operations by applying biases and drives to couplers, thereby reducing errors and increasing quantum volume through higher connectivity and reduced swap operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If qubits are coupled over long distances using conventional methods, then connectivity between qubits is achieved, but measurement quality and qubit state are degraded
Solution Approach 1:
The patent introduces a junction as an intermediary component that couples multiple tunable couplers together. This junction enables indirect coupling between qubits over long distances while maintaining measurement quality, as the junction acts as a mediator that prevents direct harmful interactions between distant qubits while still enabling quantum gate operations through the tunable couplers.
Solution Approach 2:
The patent employs tunable couplers that can dynamically adjust their coupling strength. By making the couplers tunable rather than fixed, the system can optimize coupling conditions for different qubit pairs and operation modes, enabling high-fidelity long-distance coupling when needed while maintaining measurement quality by reducing coupling when not needed.
2Adaptability or versatility
If additional gate operations are performed to achieve qubit coupling, then connectivity is improved, but error rates increase
Solution Approach 1:
The patent segments the coupling path into multiple independent tunable couplers connected through a junction. This segmentation allows each coupler to be independently optimized and controlled, enabling direct long-distance coupling between qubits without requiring multiple sequential gate operations, thereby reducing cumulative error rates while maintaining connectivity.
3Quantity of substance
If quantum computing devices expand in size and quantity of qubits, then computational capability increases, but coupling challenges and error rates worsen
Solution Approach 1:
The patent creates a universal coupling architecture where a single junction can mediate coupling between multiple qubits through different tunable couplers. This multi-functional design allows the same junction structure to support scaling to any number of qubits while maintaining consistent coupling quality, enabling the system to expand in size without degrading coupling reliability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances quantum volume and improves quantum algorithm implementations by reducing the number of gates and errors, allowing for higher connectivity operations, including simultaneous execution of operations across multiple qubits, thereby improving the coherence and availability of qubits.
Implementation Method 1
the first coupler and the second coupler are parametrically drivable
Implementation Method 2
the first coupler and the second coupler can comprise superconducting quantum interference devices or Josephson junctions
Implementation Method 3
a junction coupling the first coupler and the second coupler
Implementation Method 4
use of plural electronic devices and/or systems in combination with one another to reduce thermal population of loading
Data Source
AI summary
One or more systems, devices, and/or methods of manufacture and/or use provided herein relate to a quantum computing process to achieve higher connectivity of qubits to more than nearest neighbors and/or to a plurality of nearest neighbors. A system can comprise a tunable first coupler coupled to a first qubit, a tunable second coupler coupled to a second qubit, and a junction coupling the first coupler and the second coupler being both parametrically drivable. The first coupler and the second coupler can comprise superconducting quantum interference devices or Josephson junctions. The junction can comprise a central hub or central node separately coupled to the first coupler and the second coupler. The first coupler and the second coupler can be configured to capacitively or inductively couple the first qubit and the second qubit to one another to perform a control-Z (CZ) gate or an iSWAP gate.