Qubit Reset Using Dynamic Dissipation Coupling for High-Fidelity Operation
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Solution Overview
Problem
Existing quantum computing technologies face challenges in resetting superconducting qubits with high fidelity and efficiency, particularly in achieving reset fidelities above 99% within the required 10 nanosecond time scale for coherent operation.
Innovation Solution
An arrangement and method for resetting qubits using an energy dissipation structure, such as a normal metal-insulator-superconductor (NIS) or superconductor-insulator-normal metal-insulator-superconductor (SINIS) junction, with a control unit that controls the coupling strength between the qubit and the energy dissipation structure through a control signal, employing a temporally linearly decreasing and sinusoidal decoupling protocol to minimize initialization errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional reset protocols are used, then the qubit can be reset to ground state, but the reset fidelity remains below 99% and the reset time exceeds 10 nanoseconds
Solution Approach 1:
The patent applies dynamics by making the coupling strength between the qubit and energy dissipation structure time-dependent. The coupling strength varies during the reset protocol, initially being strong to enable fast energy dissipation, then gradually decreasing to minimize initialization errors. This dynamic adjustment of coupling strength allows the system to achieve both fast reset times and high reset fidelities above 99%
Solution Approach 2:
The patent changes the parameter of coupling strength from a static value to a time-varying parameter. By controlling the coupling strength to follow a specific temporal profile (strong initially, then decreasing), the system optimizes both the speed and accuracy of qubit reset. This parameter change enables the reset process to complete within 10 nanoseconds while maintaining fidelities above 99%
2Speed
If the coupling strength between qubit and energy dissipation structure is increased, then the reset speed increases, but initialization errors increase
Solution Approach 1:
The patent resolves this contradiction by dynamically adjusting the coupling strength during the reset process. The coupling is strong at the beginning to enable fast energy dissipation and high reset speed, then gradually decreases toward the end of the reset protocol. This time-dependent variation allows the system to achieve fast reset speeds while minimizing initialization errors that would occur with constantly strong coupling
Solution Approach 2:
The patent applies preliminary action by establishing strong coupling at the start of the reset protocol to quickly dissipate energy from the qubit. After this initial fast reset phase, the coupling strength is reduced to perform a refinement phase that minimizes initialization errors. This two-stage approach with preliminary strong coupling followed by gentle decoupling achieves both speed and precision
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 method enables faster and more efficient qubit resetting with reduced initialization errors, ensuring high-fidelity quantum computations by optimizing the coupling and decoupling processes.
Implementation Method 1
The energy dissipation structure is configured to dissipate energy transferred to the energy dissipation structure from the at least one qubit
Data Source
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AI summary
It is an objective to provide an arrangement for resetting at least one qubit. According to an embodiment, an arrangement for resetting at least one qubit comprises at least one qubit; an energy dissipation structure selectively couplable to the at least one qubit; and a control unit, configured to reset the at least one qubit by performing: couple the at least one qubit to the energy dissipation structure for a reset period using a control signal, wherein the control signal controls a coupling strength between the at least one qubit and the energy dissipation structure; and after the reset period, decouple the at least one qubit from the energy dissipation structure during a decoupling period using the control signal, wherein the coupling strength comprises, during the decoupling period, at least a temporally linearly decreasing component and at least one temporally sinusoidal component.