Josephson Parametric Oscillator Coupling via Pump Phase Control
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Solution Overview
Problem
Current superconducting quantum circuit technologies face challenges in achieving high scalability and tunable coupling strength, requiring a large number of electronic components and complex configurations for four-body interaction manipulation.
Innovation Solution
A superconducting quantum circuit apparatus comprising two or four Josephson parametric oscillators with a SQUID loop and a coupler, where the relative phase of pump signals is adjusted to vary the strength of two-body or four-body interactions, enabling scalable and tunable coupling without the need for additional drive signals or complex circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If variable coupling strength scheme is used for qubit coupling, then coupling strength can be tuned for convenience of use in quantum computation, but device complexity increases due to requiring resonators or couplers
Solution Approach 1:
The patent applies parameter changes by utilizing the phase parameter of pump signals to control coupling strength. By varying the phase difference between pump signals applied to different JPOs, the coupling strength between qubits can be continuously tuned without changing the physical circuit configuration. This resolves the contradiction by achieving tunability through parameter modulation rather than structural complexity.
Solution Approach 2:
The system uses the pump signals already required for JPO operation to simultaneously control the coupling strength. The same pump signals that drive the parametric oscillation also provide the phase control for tuning coupling, eliminating the need for separate control mechanisms and reducing overall device complexity.
2Adaptability or versatility
If four-body interaction manipulation is implemented using conventional methods, then quantum annealing can be performed, but a large number of electronic components and complex configurations are required
Solution Approach 1:
The patent merges the functions of qubit operation and interaction control into a unified system. By applying pump signals that simultaneously drive parametric oscillation and control four-body interactions through phase relationships, the system achieves complex quantum annealing functionality without requiring separate components for each function, thereby reducing the number of electronic components needed.
Solution Approach 2:
The pump signals serve multiple functions: they drive the parametric oscillation of JPOs, enable two-body interactions, control four-body interactions through phase adjustment, and provide qubit coupling control. This multi-functionality eliminates the need for dedicated components for each interaction type, significantly reducing 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 configuration allows for adjustable coupling strengths, enhancing scalability and simplifying the implementation of superconducting quantum circuits by varying the relative phase of pump signals, thereby facilitating more efficient and flexible quantum interactions.
Implementation Method 1
a pump line, with a pump signal supplied thereto, providing a magnetic flux penetrating through the loop of the SQUID
Implementation Method 2
a SQUID (Superconducting Quantum Interference Device) including a first superconducting line, a first Josephson junction, a second superconducting line, and a second Josephson junction connected in a loop
Implementation Method 3
a phase adjuster that varies a relative phase between or among pump signals supplied for parametric oscillation to the pump lines of the two or four Josephson parametric oscillators, respectively, to vary a strength of a two-body or four-body interaction
Implementation Method 4
a coupler to couple the two or four Josephson parametric oscillators
Data Source
AI summary
A superconducting quantum circuit apparatus, including: two or four Josephson parametric oscillators, JPOs, each including: a SQUID; and a pump line, with a pump signal supplied thereto, providing a magnetic flux penetrating through the loop of the SQUID, the JPOs oscillating parametrically in response to the pump signal supplied to the pump line; a coupler to couple the two or four JPOs; and a phase adjuster that varies a relative phase between or among pump signals supplied respectively to the pump lines of the two or four JPOs for parametric oscillation, to vary a strength of a two-body or four-body interaction.