QCCD Quantum Gate Set Using Global Gates Without Qubit Addressing
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Solution Overview
Problem
The performance of quantum gates in quantum charge-coupled devices (QCCD) architecture is hindered by the slow and heating-inducing process of physically isolating atomic objects for gate operations, necessitating inefficient cooling processes.
Innovation Solution
A method for performing general two-qubit gates using frame rotations and phase-independent two-qubit gates on proximate atomic objects, utilizing manipulation signals to achieve arbitrary angle rotations without requiring qubit addressing, and minimizing cooling operations between gate performances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If atomic objects are physically isolated for gate operations, then gate operation reliability is improved, but operation speed deteriorates and heating occurs
Solution Approach 1:
The patent replaces the mechanical/physical isolation process with a field-based approach using manipulation signals (laser beams, microwave fields) to perform gate operations on proximate atomic objects. This substitution eliminates the need for slow physical transport and isolation while maintaining gate operation reliability through precise field control.
Solution Approach 2:
The patent introduces manipulation signals as intermediaries to mediate interactions between proximate atomic objects. These signals enable gate operations without requiring direct physical contact or isolation, thus improving speed while maintaining reliability through the mediating field interactions.
2Reliability
If atomic objects are physically isolated for gate operations, then gate operation reliability is improved, but cooling operations are required more frequently
Solution Approach 1:
By replacing physical isolation with field-based manipulation, the patent eliminates the heating that necessitates cooling operations. The manipulation signals interact with proximate atomic objects without the mechanical contact that generates heat, thereby reducing cooling requirements and time loss.
Solution Approach 2:
The patent enables continuous gate operations on proximate atomic objects without interruption for cooling. By using field-based manipulation rather than physical isolation, the system maintains continuous useful action without the periodic interruptions required for thermal management in traditional approaches.
3Measurement precision
If qubit addressing is implemented for single-qubit gates, then gate precision is improved, but device complexity increases
Solution Approach 1:
The patent applies local quality by using spatially selective manipulation signals that target specific atomic objects within a proximate group. The manipulation signals are configured with specific frequencies, phases, and amplitudes that interact selectively with individual qubits, achieving precise gate operations without requiring full addressing infrastructure.
Solution Approach 2:
The patent implements a universal gate set where the same manipulation signal infrastructure performs both single-qubit and two-qubit gate operations. By using frame rotations and phase-independent two-qubit gates with arbitrary angles, the system achieves multi-functionality without increasing device complexity, as the same hardware resources handle diverse quantum operations.
Data Source
AI summary
A controller of a QCCD-based quantum computer is configured to perform arbitrary angle two-qubit gates using global single-qubit gates and rotations of arbitrary angles and/or individual single-qubit gates that include two-qubit gate primitives, such as a phase-independent anti-symmetric two-qubit gate, and that are not individually addressed.