Cat Qubit Gate Control for Fast Noise-Bias Preservation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing quantum computing technologies face challenges in performing fast and high-fidelity gate operations on cat qubits while preserving noise bias, as conventional non-adiabatic operations lead to quantum information leakage and reduced gate fidelity.
Innovation Solution
The implementation of counterdiabatic control drives in conjunction with truncated Gaussian pulses for quantum gate operations on Kerr cat qubits, which stabilizes the qubits and suppresses non-adiabatic errors, allowing for faster and more reliable noise-bias-preserving gate operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adiabatic quantum operations are used to preserve noise bias, then noise bias is maintained, but gate operation speed becomes slow
Solution Approach 1:
The patent introduces counterdiabatic control drives as intermediary components that mediate between the base gate drive and the quantum system. These additional control fields act as mediators to suppress non-adiabatic transitions and quantum information leakage, enabling faster gate operations while preserving noise bias. The counterdiabatic drives compensate for the harmful effects of rapid gate operations, allowing the system to achieve both high speed and noise bias preservation simultaneously.
2Speed
If non-adiabatic operations with stronger drives are used to increase gate speed, then gate operation speed increases, but quantum information leakage increases and noise bias is lost
Solution Approach 1:
The patent applies preliminary anti-action by introducing counterdiabatic control drives that are specifically designed to counteract the harmful effects of non-adiabatic transitions before they can degrade the quantum state. These control fields are applied in advance and throughout the gate operation to prevent quantum information leakage and maintain noise bias, rather than attempting to correct errors after they occur. This proactive approach allows strong drives to be used without sacrificing reliability.
3Loss of time
If non-adiabatic operations are used to reduce gate time, then gate operation time decreases, but non-adiabatic errors increase
Solution Approach 1:
The counterdiabatic control drives serve as intermediary fields that mediate the transition between the base gate drive and the quantum system during rapid gate operations. These intermediary controls suppress non-adiabatic errors by compensating for the effects of fast time-varying fields, thereby maintaining high gate fidelity even when gate operation time is significantly reduced. The intermediary drives effectively decouple the gate speed from the error rate.
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 approach enables high-fidelity and fast gate operations while maintaining noise bias, reducing logical error rates in quantum error correction and improving the overall performance of quantum computing systems.
Implementation Method 1
applying, according to the type of the NBP quantum gate, the quantum operation on the qubit to obtain a modified qubit, the quantum operation comprising a base gate drive and a counterdiabatic (CD) control drive
Implementation Method 2
in response to the qubit being in an idle state, applying a two-photon dissipation operation on the qubit to stabilize the qubit, the two-photon dissipation operation corresponding to a two-photon drive
Implementation Method 3
stabilizing some example cat qubits and preserving noise bias
Data Source
AI summary
The present disclosure describes various methods, systems, and storage medium for engineering fast bias-preserving gates on stabilized cat qubits. One method for performing a quantum operation on a qubit using a noise-bias-preserving (NBP) quantum gate includes obtaining and stabilizing the qubit; determining a type of the NBP quantum gate associated with the quantum operation, according to type of the NBP quantum gate, the quantum operation on the qubit to obtain a modified qubit, the quantum operation comprising a base gate drive and a counterdiabatic (CD) control drive. Another method for stabilizing a qubit for quantum storage includes obtaining a qubit; in response to the qubit being in an idle state, applying a two-photon dissipation operation on the qubit to stabilize the qubit, the two-photon dissipation operation corresponding to a two-photon drive.