Coupled Qubit Flux Control for AC Stark Shift Compensation
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Solution Overview
Problem
Existing electronic circuits and computing devices with multiple nonlinear elements face challenges in achieving high-speed and high-fidelity two-qubit gate operations due to resonance frequency shifts caused by AC Stark shifts.
Innovation Solution
A computing device design incorporating a first qubit and a second qubit connected via capacitive coupling, with a controller applying a pulse wave including a DC component and a signal wave including an AC component to modulate magnetic flux, compensating for resonance frequency shifts and enabling high-speed two-qubit gate operations with improved fidelity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If AC signal waves are applied to modulate magnetic flux for two-qubit gate operations, then gate operation speed is improved, but resonance frequency shifts occur due to AC Stark shifts reducing gate fidelity
Solution Approach 1:
The patent applies a DC component to the magnetic flux modulation in advance to counteract the AC Stark shift effect that would otherwise cause resonance frequency shifts. By pre-compensating for the frequency shift through DC bias adjustment, the system maintains both high-speed operation (through AC modulation) and high fidelity (by preventing resonance detuning)
Solution Approach 2:
The patent dynamically adjusts the DC component of the magnetic flux modulation parameter to compensate for AC Stark shift effects. By changing the DC bias level based on the AC signal characteristics, the system maintains resonance conditions and achieves both high-speed gate operations and high gate fidelity
2Adaptability or versatility
If multiple nonlinear elements are used in electronic circuits, then computing functionality is enhanced, but device complexity increases
Solution Approach 1:
The patent combines multiple qubit systems with nonlinear elements into an integrated quantum computing device where qubits are coupled through controlled interactions. By merging individual qubit functionalities into a coordinated multi-qubit system, the patent achieves enhanced computing capability while managing complexity through systematic coupling designs
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
The proposed design enables high-speed two-qubit gate operations with enhanced gate fidelity, compensating for resonance frequency shifts and improving overall device characteristics.
Implementation Method 1
a first qubit (11Q) including a first loop (11L) including a plurality of first Josephson junctions (11), and a second qubit (12Q) including a second loop (12L) including a plurality of second Josephson junctions (12)
Implementation Method 2
the second qubit (12Q) being configured to be connected with the first qubit (11Q)
Implementation Method 3
the controller (70) being configured to cause the first control member (71) to execute a first operation (OP1). In the first operation (OP1), the controller (70) is configured to cause the first control member (71) to apply a pulse wave (PS1) including a DC component to the first loop (11L) while applying a first signal wave (AS1) including a first AC component to the first loop (11L)
Data Source
AI summary
According to one embodiment, a computing device includes an element section, a first control member, and a controller. The element section includes a first qubit including a first loop including a plurality of first Josephson junctions, and a second qubit including a second loop including a plurality of second Josephson junctions. The second qubit is configured to be connected with the first qubit. The controller is configured to cause the first control member to execute a first operation. In the first operation, the controller is configured to cause the first control member to apply a pulse wave including a DC component to the first loop while applying a first signal wave including a first AC component to the first loop.