Multimode Resonator Coupling Structure for RIP Gate
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Solution Overview
Problem
Conventional qubit coupling structures for resonator-induced phase (RIP) gates face the challenge of increasing qubit frequency shift leading to undesirable quantum entanglement between qubits when the RIP gate is not in operation.
Innovation Solution
A qubit coupling structure with multiple coupling pathways, including a resonator with transmission line shunts and quarter wavelength superconducting waveguides, is designed to suppress qubit-qubit coupling interactions by controlling the difference in qubit-qubit coupling frequency and resonance frequency, enabling a RIP gate while minimizing entanglement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the qubit coupling structure enables a large qubit frequency shift for RIP gate, then the RIP gate performance is improved, but the quantum entanglement between qubits increases undesirably when RIP is not active
Solution Approach 1:
The coupling structure is divided into multiple independent coupling pathways (first coupling pathway, second coupling pathway, third coupling pathway) that can be independently controlled. Each pathway connects the qubits through different routes with different frequency characteristics, allowing selective activation of specific pathways during RIP gate operation while keeping others inactive to suppress unwanted entanglement
Solution Approach 2:
The system changes the operational parameters of different coupling pathways by tuning their respective frequencies. The first coupling pathway is tuned to a first frequency, the second to a second frequency, and the third to a third frequency. By controlling which frequency pathways are active, the system can enable strong coupling for RIP gate when needed while suppressing coupling through frequency detuning during idle periods, thereby reducing unwanted entanglement
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 structure effectively reduces undesirable quantum entanglement between qubits when the RIP gate is not active, allowing for a high qubit frequency shift during operation while maintaining low entanglement, thus enhancing qubit fidelity.
Implementation Method 1
A signal in the resonator and, therefore, the Stark shift the qubit experience will depend on a joint state of the qubits
Implementation Method 2
The quarter wavelength superconducting waveguide can have multiple impedances. An advantage of such an apparatus can be the formation of a multimode resonator coupled to the first and second qubits
Implementation Method 3
two coupled qubits can be capacitively coupled to respective ends of a length of co-planar waveguide
Implementation Method 4
the co-planar waveguide can create an interaction between the qubits, where the frequency of each qubit can depend on the state of the other
Data Source
AI summary
Techniques regarding qubit coupling structures that enable RIP gates are provided. For example, one or more embodiments described herein can comprise an apparatus that can include a coupling structure coupled to a first qubit and a second qubit. The coupling structure can have a plurality of coupling pathways. A coupling pathway from the plurality of coupling pathways can be a resonator. Also, the first qubit can be coupled to a first end of the resonator, and the second qubit can be coupled to a point along a length of the resonator.