Modular Qubit Devices With Tapered Transmission Line Resonators
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Solution Overview
Problem
Current technologies face challenges in realizing scalable quantum processors with high-fidelity multi-qubit operations between qubits on separate physical chips, requiring improved coupling methods and modular architectures to reduce production and maintenance costs.
Innovation Solution
The development of modular qubit devices with transmission line resonators that are either capacitively or inductively coupled, allowing qubits on separate chips to be interconnected with adjustable coupling, enabling modular repair and scalable production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If qubits are placed on separate physical chips to enable modular architecture, then ease of manufacture and maintenance are improved, but coupling fidelity and operational reliability deteriorate
Solution Approach 1:
A tapered transmission line resonator is introduced as an intermediary component between qubits on separate chips. The resonator acts as a mediator that enables high-fidelity coupling through its impedance transformation properties, resolving the contradiction by providing a reliable coupling mechanism that works specifically for the modular architecture scenario.
Solution Approach 2:
The resonator's impedance parameter is changed along its length through tapering, transitioning from a first impedance value at the qubit interface to a second impedance value at the inter-chip interface. This parameter change enables impedance matching that maximizes coupling fidelity while maintaining modular chip architecture.
2Device complexity
If traditional fixed-impedance resonators are used, then device complexity is reduced, but signal reflections from qubits increase
Solution Approach 1:
The resonator is designed with non-uniform local properties through tapering, where the impedance varies continuously along its length. This local quality variation enables the resonator to adapt to different impedance environments (qubit interface vs. inter-chip interface), minimizing reflections without requiring complex external matching networks.
3Reliability
If entire quantum processor systems are replaced for maintenance, then operational reliability is maintained, but maintenance time and cost increase
Solution Approach 1:
The quantum processor is segmented into independent modular chips, each containing complete functional units (qubits coupled to resonators). This segmentation enables maintenance of individual chips rather than entire systems, reducing maintenance time and cost while maintaining overall system reliability through selective replacement of only faulty modules.
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 multi-qubit operations across separate chips, facilitating scalable quantum processors with reduced production and maintenance costs, and allowing for easier repair of individual modules rather than entire systems.
Implementation Method 1
the resonator comprises a taper configured to provide a first impedance at the first portion of the resonator and a second impedance at a second portion of the resonator, wherein the first impedance is distinct from the second impedance. An advantage of such a device is that the taper of the resonator can reduce reflections from the qubit.
Implementation Method 2
a first module comprising a first qubit coupled to a first transmission line resonator comprising a first flux controlled coupler, and a second module comprising a second qubit coupled to a second transmission line resonator comprising a second flux controlled coupler, wherein the first module is embodied in a first chip and wherein the second module is embodied in a second chip, and wherein the first transmission line resonator is coupled to the second transmission line resonator. An advantage of such a device is that the flux controlled couplers enable adjustment of the coupling between the first qubit and the second qubit.
Data Source
AI summary
One or more systems, devices and/or methods of use herein relate to modular quantum devices. According to an embodiment, a device can comprise a first module comprising a first qubit coupled to a first transmission line resonator, and a second module comprising a second qubit coupled to a second transmission line resonator, wherein the first module is embodied on a first chip and wherein the second module is embodied on a second chip.