Parametric Single-Qubit Gate Activation Using Low-Frequency Control
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Solution Overview
Problem
Existing quantum logic gates are difficult to tune and characterize, have low fidelity, and are prone to errors due to control imperfections, making them less efficient and less robust in quantum computing systems.
Innovation Solution
Implementing parametrically activated single-qubit quantum logic gates using control signals with frequencies below the qubit operating frequencies, which are easier to tune, have a higher on/off ratio, and are less susceptible to control errors, enabling higher spatial density and lower control overhead in quantum processing units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional quantum logic gates are used, then quantum computing operations can be performed, but the gates are difficult to tune and characterize, have low fidelity, and are prone to control errors
Solution Approach 1:
The patent changes the frequency parameter of control signals from high frequency (matching qubit operating frequency) to low frequency (below qubit operating frequency), enabling parametric activation of quantum logic gates. This parameter change improves gate fidelity and ease of tuning while maintaining operational capability
Solution Approach 2:
The patent employs periodic modulation of control signals at low frequencies to parametrically activate quantum logic gates. This periodic action enables precise control and characterization of gates while improving fidelity and reducing susceptibility to control errors
2Reliability
If high frequency control signals are used, then quantum logic gates can be activated, but the system is more susceptible to control imperfections and errors
Solution Approach 1:
The patent changes the frequency parameter from high to low, making the quantum logic gates less susceptible to control imperfections and errors while maintaining gate activation capability through parametric resonance
3Quantity of substance
If conventional quantum logic gates are implemented, then quantum algorithms can be executed, but the spatial density of qubits is limited and cooling power requirements are high
Solution Approach 1:
The patent changes the control signal frequency parameter to enable parametric activation, which reduces cooling power requirements and allows higher spatial density of qubits in the quantum processing unit
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 parametrically activated gates achieve faster gate times, higher fidelity, and improved robustness against control imperfections, allowing for higher spatial density of qubits and reduced cooling power requirements, while maintaining quantum coherence and addressability.
Implementation Method 1
a single-qubit control operation, such as a single-qubit quantum logic gate, is parametrically activated and performed by operating a tunable qubit device
Implementation Method 2
The modulation frequency may be an odd subharmonic of an average transition frequency of the tunable qubit device under modulation
Data Source
AI summary
In a general aspect, a parametrically activated single-qubit quantum logic gate is performed in a quantum computing system. In some cases, a superconducting quantum processing unit includes a tunable qubit device. A single-qubit quantum logic gate is performed on a qubit defined by the tunable qubit device by communicating one or more control signals from a control system to the tunable qubit device. The tunable qubit device has a range of qubit operating frequencies, and the one or more control signals include only frequencies that are below the range of qubit operating frequencies.