Quantum computing designs with increased qubit lifetimes

Applications: Quantum Computing

Circuit quantum electrodynamics (cQED) is a promising platform for quantum computing, enabling the preparation of stable quantum states with good lifetimes. Oxford have applied microwave engineering concepts to develop method to engineer wideband Purcell filtering without the need to add additional circuits.

Features	Benefits
Addition of symmetry breaking features (i.e. Fig 1b) to conventional Transmon qubits produces interference effects and/or additional functionality.	Significantly improves the qubit relaxation time and reduces operational errors in the quantum processor by suppressing the Purcell effect.
The interference effects can produce a transmission minima (Fig 2) at the qubit frequencies.	Removes the need for a physical circuit or other devices to Purcell filter qubit frequencies.
Different positions and geometrical arrangements of the symmetry breaking feature allows a range of functionality to be introduced into the cQED device.	Simplifies quantum processor design and facilitates scaling up the system to accommodate more qubits with flexible connectivity and reduced crosstalk.
Oxford’s simulation tools enable calculation of well-defined features that achieve target interference and functionality for a given cQED device.	The fabrication of cQED devices with geometric symmetry breaking features is easily controlled, reproducible and low-cost.

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Quantum computing designs with increased qubit lifetimes

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