Superconducting circuit and quantum computer
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Solution Overview
Problem
Implementing four-body interaction in a quantum annealing circuit using superconducting parametric oscillators requires supplying high-frequency signals of different frequencies, complicating the configuration and operation.
Innovation Solution
A superconducting circuit design that includes four superconducting qubit circuits connected by a coupling circuit, where each qubit circuit can be in a first or second phase state, and the interaction term of the Hamiltonian takes different values based on the number of qubits in the first phase state, allowing all qubits to be supplied with signals of the same frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If four superconducting parametric oscillators are coupled by one coupling circuit, then four-body interaction is implemented, but four high-frequency signal generators are required with complex frequency relationships
Solution Approach 1:
The patent merges the signal generation function into a single signal generator that produces one high-frequency signal, which is then distributed to all four superconducting parametric oscillators. This eliminates the need for four separate signal generators with complex frequency relationships (ω1+ω2=ω3+ω4), reducing device complexity while maintaining the four-body interaction capability through the coupling circuit.
Solution Approach 2:
A single high-frequency signal serves multiple functions by being supplied to all four superconducting parametric oscillators simultaneously. This universal signal generation approach allows the system to achieve four-body interaction without requiring specialized frequency relationships between multiple generators, simplifying the overall system configuration.
2Productivity
If all qubit circuits are coupled to achieve full connectivity, then quantum annealing performance is improved, but hardware implementation becomes more difficult with increasing number of bits
Solution Approach 1:
The patent introduces a coupling circuit as an intermediary component that enables full coupling between all qubit circuits. This coupling circuit acts as a mediator that achieves complete connectivity (all-to-all coupling) among the four superconducting parametric oscillators without requiring direct complex wiring between each pair of qubits, thereby improving quantum annealing performance while managing hardware implementation difficulty.
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
Enables the implementation of four-body interaction using superconducting qubits supplied with the same frequency, simplifying the circuit configuration and operation.
Implementation Method 1
The coupling circuit includes a plurality of sub-coupling circuits each including a plurality of capacitors and one Josephson junction
Implementation Method 2
each including a plurality of capacitors and one Josephson junction
Data Source
AI summary
A superconducting circuit and a quantum computer capable of implementing four-body interaction using a plurality of superconducting qubit circuits supplied with signals of the same frequency are provided. A superconducting circuit (1) includes four superconducting qubit circuits (10), a coupling circuit (20) directly connected 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.