Superconducting Circuit Four-Body Interaction Hardware Reduction
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Solution Overview
Problem
Existing methods for implementing four-body interaction in quantum annealing circuits require a large number of qubit circuits, doubling the number of qubits needed, which is inefficient in terms of hardware usage.
Innovation Solution
A superconducting circuit with four qubit circuits and a coupling circuit, where the interaction term of the Hamiltonian changes based on the number of qubits in the first phase state, allowing for four-body interaction with reduced hardware by using inductively coupled loop circuits and Josephson junctions with varying inductor types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the method described in Non Patent Literature 2 is used to implement four-body interaction, then the four-body interaction can be realized in hardware, but the number of qubit circuits is doubled
Solution Approach 1:
The patent merges the function of auxiliary qubit circuits into the coupling circuit itself. The coupling circuit is configured to directly generate the four-body interaction term in the Hamiltonian through its inductive coupling to four qubit circuits, eliminating the need for separate auxiliary qubit circuits. This combining of functions reduces the total number of qubit circuits from eight (four data + four auxiliary) to just four.
Solution Approach 2:
The coupling circuit acts as an intermediary that mediates the interaction between qubit circuits. Instead of using auxiliary qubit circuits to facilitate four-body interaction, the coupling circuit directly provides the mediating function through its inductive coupling mechanism, where the coupling circuit's inductors create the necessary interaction terms in the Hamiltonian without requiring additional qubit circuits.
2Reliability
If all qubit circuits are coupled to improve quantum annealing performance, then the interaction between spins is maximized, but the hardware implementation becomes more difficult
Solution Approach 1:
The coupling circuit is designed with multi-functionality to handle various interaction types. By configuring the inductors in the coupling circuit with different signs (positive or negative), the system can universally implement different coupling patterns (ferromagnetic or antiferromagnetic interactions) between qubit circuits. This universal design simplifies hardware implementation while maintaining full coupling capability for quantum annealing performance.
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 configuration enables the implementation of four-body interaction with half the number of qubits required in previous methods, reducing hardware requirements while maintaining the necessary interaction characteristics.
Implementation Method 1
a coupling circuit inductively coupled to the four superconducting qubit circuits
Implementation Method 2
a coupling circuit inductively coupled to the four superconducting qubit circuits... The coupling circuit includes four loop circuits each including an inductor and a Josephson junction
Implementation Method 3
four superconducting qubit circuits... Each of the superconducting qubit circuits indicates a qubit by being in a first phase state or a second phase state
Data Source
AI summary
A superconducting circuit and a quantum computer capable of implementing four-body interaction while reducing an amount of hardware are provided. A superconducting circuit (1) includes four superconducting qubit circuits (10), a coupling circuit (20) inductively coupled to the four superconducting qubit circuits (10). Each of the superconducting qubit circuits (10) indicates a qubit by being in a first phase state or a second phase state, when the number of the superconducting qubit circuits (10) in the first phase state among the four superconducting qubit circuits (10) is an even number, an interaction term of Hamiltonian of the superconducting circuit (1) takes a first value, and when the number of the superconducting qubit circuits (10) in the first phase state among the four superconducting qubit circuits (10) is an odd number, the interaction term takes a second value.