Quantum Computing News

Qiskit Metal

An open-source framework called Qiskit Metal makes it simple for scientists and engineers to create superconducting quantum devices. It is essential to the construction of superconducting qubits and is constructed with Python, which supports an IDE for effective coding. For quantum computing simulations, the framework allows the coding of particular parameters to produce simulations, matrices, and desired outputs. Zlatko Minev was the one who first conceived and developed it at IBM; Thomas McConkey later co-led its development.

Overview and Purpose

With its extensive environment for creating quantum devices, Qiskit Metal is largely focused on designing quantum hardware. This entails constructing separate parts, outlining complete chip designs, and carrying out different evaluations. It belongs to the larger community of Qiskit.
Important attributes and capabilities.

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Key Features and Functionality

Design and Components

Using the Qiskit Metal GUI, users can create a local simulation of a quantum chip example. QComponents, the core building blocks for every component in the Metal framework, are used to develop designs.

• Design Types: MultiPlanar, DesignFlipChip, and DesignPlanar are supported for 2D designs, which usually use Coplanar Waveguide (CPW) geometries on a single-plane chip.
• Component Library (QLibrary): A collection of preconfigured quantum elements and devices is part of Qiskit Metal. Some examples of components that are available are:
  • There are several different kinds of qubits, including Josephson Junctions (jj_dolan, jj_manhattan), TransmonConcentric, TransmonCross, and TransmonPocket, which is a conventional pocket transmon qubit for a ground plane with two pads joined by a junction.
  • CPW Meander is an example of a resonator.
  • Among the couplers are the Bus Resonator Coupler, Direct Coupler (transmon-transmon), and Tunable Coupler (MIT).
  • CPW Launch Pad, Readout Line, and Charge Line are examples of input-output coupling.
  • NGon, CircleCaterpillar, and Rectangle are examples of basic geometries.
• Interactive GUI: Users can examine, edit, and simulate a QDesign interactively with the MetalGUI. Within the GUI, users can rebuild the geometry and change component parameters.

Routing

For linking components, Qiskit Metal has extensive routing capabilities, especially for creating coplanar waveguide (CPW) pathways. These consist of:

• RouteStraight: For two pin connections that are straight.
• RouteMeander: Uses a single meander to implement a basic CPW.
• In order to prevent self-collisions and collisions with associated components, RouteFramed automatically creates a non-meandered CPW.
• RoutePathfinder: Combines basic 1-, 2-, or S-shaped segment checks with the A pathfinding algorithm.
• RouteMixed: An all-inclusive routing class that allows for various anchor connections by inheriting from RoutePathfinder and RouteMeander.

Renderers and Export

QRenderers are abstract basic classes for rendering designs and their components that can be used to export Qiskit Metal designs to a variety of formats.

• By extending QRenderer, QGDSRenderer can output files in the GDS (Graphic Database System) format, which is a standard format for semiconductor device layouts and is necessary for fabrication.
• Ansys Integration: Certain renderers, such as QHFSSRenderer and QQ3DRenderer, make it possible to render designs into Ansys HFSS and Ansys Q3D for electromagnetic simulations.
• QGeometryTables: Usually stored as Pandas DataFrames, QGeometryTables are used by all QRenderers to export data from a QDesign.

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Analysis Capabilities

A variety of tools for characterizing quantum devices are available from Qiskit Metal.

• Capacitance Matrix and LOM Analysis: This method is used to analyze capacitance matrices and develop the lumped oscillator model (LOM).
• Eigenmode and EPR Analysis: Crucial for examining the characteristics of CPW resonators and transmons alone as well as in combination.
• Impedance, Admittance, and Scattering Analysis: To describe the design’s electrical characteristics.
• Hamiltonian Models: Includes classes like Hcpb to analytically model the Cooper-pair box (CPB) Hamiltonian, solving for energy levels and wavefunctions. It can also perform analysis related to charge dispersion, energy level differences, anharmonicity, and dephasing time (T2).
• Parametric Sweeps: To learn how design factors impact performance, users can run sweeps for impedance/scattering/admittance matrices, capacitance, and eigenmode.

Customization

The features of the framework can be expanded beyond the built-in library by enabling users to design their own unique QComponents and QRenderers.

Installation and Usage

The Python package manager pip, which manages the majority of dependencies automatically, can be used to install Qiskit Metal. To avoid version conflicts, Qiskit Metal should be installed in a venv or conda environment. It is advised to use Jupyter Notebook/Lab to fully utilise the functionalities.

In a simple example, you define a DesignPlanar object, open the MetalGUI, instantiate a qubit component (such as TransmonPocket), change its parameters, and then reconstruct the design.

Technical Details and Community Support

Licensed under the Apache-2.0 license, Qiskit Metal is an open-source project. Qiskit Metal 0.1.5 was the most recent version as of June 2023. The migration of Qiskit Metal from PySide2 to PySide6, which will allow native support for Macs (Apple Silicon) and include other improvements, is almost finished.

Through discussion with developers and other participants via the #metal channel on the Qiskit Slack network, the initiative promotes community involvement. In Stack Exchange, the Qiskit tag is used for queries that are better suited for forums. To help users, extensive documentation, tutorials, and recorded sessions are also offered.

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