Quantum coherent devices with reduced energy dissipation
AssigneeLawrence Livermore National Security, LLC
InventorsYaniv Rosen, Jonathan Dubois, Eric Thomas Holland, Matthew A. Horsley
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Abstract
The disclosed technology can be used to increase lifetimes of quantum coherent devices such as qubits including transmons and xmons and to reduce the losses in resonators. Energy stored in superconducting devices can be lost by emission of phonons that couple to the environment. Defects in one or more materials in the quantum coherent device can cause the coupling to phonons. Patterning one or more of the layers creates a phononic bandgap that reduces or eliminates the emission of the phonons to the environment. The energy then couples back to the quantum coherent device.
Claims22
A quantum coherent apparatus comprising:
- one or more superconducting devices structured to exhibit different quantum states for quantum computing, each superconducting device including
- a plurality of layers comprising
- a patterned layer structured to exhibit a phononic bandgap;
- and
- another layer coupled to the patterned layer, wherein a defect in the plurality of layers causes a one-way coupling of energy away from the quantum coherent apparatus via phonons excited within the phononic bandgap so that the phononic bandgap increases a lifetime of the quantum coherent device by reducing the one-way coupling of energy via the phonons.
A method of extending the lifetime of a quantum coherent device, the method comprising:
- storing energy in one or more superconducting devices;
- and
- prohibiting a band of phonon emission energies by patterning a layer of material to create a phononic bandgap to cause a one-way coupling of energy away from the quantum coherent device via phonons, wherein the phononic bandgap increases a lifetime of the quantum coherent device by reducing the one-way coupling of energy via the phonons.
Dependencies are inferred from the claim text.