Probe Qubit Inductance Tuning for Quantum Energy Eigenvalue Determination
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Solution Overview
Problem
Current quantum processor architectures are limited in their ability to implement new and alternative algorithms, particularly in determining energy eigenvalues of a problem Hamiltonian, and in efficiently scanning transition rates of probe qubits for energy bias values.
Innovation Solution
A quantum processor design that includes a plurality of superconducting flux qubits, with a probe qubit having a reduced geometric inductance and increased Josephson inductance, allowing for tunable communicative coupling with computation qubits, and a programming subsystem to apply energy biases and tunneling energies, enabling the scanning of transition rates for energy eigenvalue determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a quantum processor uses conventional superconducting flux qubits with standard geometric inductance, then the device complexity is manageable, but the spectral resolution and energy eigenvalue determination accuracy are limited
Solution Approach 1:
The patent applies local quality by creating a probe qubit with distinct local properties (reduced geometric inductance, increased Josephson inductance) different from conventional computation qubits. This localized structural modification enables the probe qubit to achieve higher spectral resolution for energy eigenvalue determination without requiring all qubits in the system to be redesigned, thus improving measurement precision while controlling overall device complexity.
Solution Approach 2:
The patent implements dynamics by making the probe qubit's coupling to computation qubits tunable and adjustable. The communicative coupling strength can be dynamically modified to optimize the interaction between the probe and computation qubits during different stages of the energy eigenvalue determination process, enabling adaptive measurement conditions that enhance spectral resolution.
2Measurement precision
If the probe qubit has reduced geometric inductance and increased Josephson inductance, then the spectral resolution and energy eigenvalue determination improve, but the manufacturing precision requirements increase
Solution Approach 1:
The patent applies parameter changes by systematically modifying the inductance parameters of the probe qubit (reducing geometric inductance, increasing Josephson inductance) to optimize its measurement capabilities. These parameter changes are designed to shift the operational regime of the qubit to one that provides enhanced spectral resolution. By carefully selecting and adjusting these parameters, the patent achieves improved energy eigenvalue determination accuracy while managing the associated manufacturing precision requirements through deliberate design choices.
3Productivity
If the quantum processor implements tunable communicative coupling between probe and computation qubits, then the efficiency of transition rate scanning improves, but the device complexity increases
Solution Approach 1:
The patent implements dynamics by making the coupling between the probe qubit and computation qubits tunable and adjustable. The communicative coupling strength can be dynamically modified to optimize the interaction between the probe and computation qubits during different stages of the energy eigenvalue determination process, enabling adaptive measurement conditions that enhance spectral resolution.
Solution Approach 2:
The patent applies universality by designing the coupling mechanism to serve multiple functions: it enables both the probe qubit to measure energy eigenvalues and allows for dynamic adjustment of interaction strength. This multi-functional coupling system can adapt to different measurement requirements and computational tasks, improving productivity while justifying the increased device complexity through its versatility.
4Reliability
If the quantum processor reduces noise and defect coupling in the probe qubit, then the reliability of energy eigenvalue determination improves, but the ease of manufacture decreases
Solution Approach 1:
The patent applies local quality by creating a probe qubit with distinct local properties (reduced geometric inductance, increased Josephson inductance) different from conventional computation qubits. This localized structural modification enables the probe qubit to achieve higher spectral resolution for energy eigenvalue determination without requiring all qubits in the system to be redesigned, thus improving measurement precision while controlling overall device complexity.
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 design enhances spectral resolution and facilitates the determination of energy eigenvalues, improving the performance of quantum processors in adiabatic quantum computation and quantum annealing by reducing noise and defect coupling, thereby improving the accuracy and efficiency of macroscopic resonant tunneling operations.
Implementation Method 1
The transition rate of the probe qubit may at least partially depend on a probability of the probe qubit transitioning from a first state to a second state by macroscopic quantum tunneling
Implementation Method 2
a compound Josephson junction that may interrupt the loop of superconducting material, the compound Josephson junction may include at least two Josephson junctions that are superconductingly electrically coupled in parallel with one another
Implementation Method 3
A quantum processor may include: a loop of superconducting material having a geometric inductance LGp
Data Source
AI summary
Systems and methods for employing macroscopic resonant tunneling operations in quantum processors are described. New modes of use for quantum processor architectures employ probe qubits to determine energy eigenvalues of a problem Hamiltonian through macroscopic resonant tunneling operations. A dedicated probe qubit design that may be added to quantum processor architectures is also described. The dedicated probe qubit enables improved performance of macroscopic resonant tunneling operations and, consequently, improved performance of the new modes of use described.