Cassandra Chua

Reply to: On the robustness of topological gap detection via transport

Microsoft Quantum, Morteza Aghaee, Alejandro Alcaraz Ramirez, Zulfi Alam et autres

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Toward the Scalable Fabrication of Thin-Film Superconducting Parametric Amplifiers

A. El Kass, Kevin Simoes, Cassandra Chua, D. J. Reilly et autres

Kinetic inductance travelling-wave parametric amplifiers (KTWPAs) are emerging as core components in many applications where wideband cryogenic rf amplification at or near the quantum limit of added noise is critical. These thin film superconducting devices are unique in their ability to simultaneously …

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Interferometric single-shot parity measurement in InAs–Al hybrid devices

Morteza Aghaee, Alejandro Alcaraz Ramirez, Zulfi Alam, Rizwan Ali et autres

The fusion of non-Abelian anyons is a fundamental operation in measurement-only topological quantum computation1. In one-dimensional topological superconductors (1DTSs)2–4, fusion amounts to a determination of the shared fermion parity of Majorana zero modes (MZMs). Here we introduce a device architecture5 that is …

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Engineering long spin coherence times of spin–orbit qubits in silicon

Takashi Kobayashi, Joe Salfi, Cassandra Chua, Brett C. Johnson

Electron-spin qubits have long coherence times suitable for quantum technologies. Spin–orbit coupling promises to greatly improve spin qubit scalability and functionality, allowing qubit coupling via photons, phonons or mutual capacitances, and enabling the realization of engineered hybrid and topological quantum systems. However, …

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Towards the Scalable Fabrication of thin-film Superconducting Parametric Amplifiers

Abdallah El Kass, Kevin Simoes, Cassandra Chua, D. J. Reilly et autres

Kinetic inductance travelling-wave parametric amplifiers (KTWPAs) are emerging as core components in many applications where wideband cryogenic rf amplification at or near the quantum limit of added noise is critical. These thin film superconducting devices are unique in their ability to simultaneously …

Interferometric Single-Shot Parity Measurement in an InAs-Al Hybrid Device

Morteza Aghaee, Alejandro Alcaraz Ramirez, Zulfi Alam, Rizwan Ali et autres

The fusion of non-Abelian anyons or topological defects is a fundamental operation in measurement-only topological quantum computation. In topological superconductors, this operation amounts to a determination of the shared fermion parity of Majorana zero modes. As a step towards this, we implement …

Flopping-Mode Electric Dipole Spin Resonance in Phosphorus Donor Qubits in Silicon

F. N. Krauth, Samuel Keith Gorman, Yu He, M. Thomas. Jones et autres

Single spin qubits based on phosphorus donors in silicon are a promising candidate for a large-scale quantum computer. Despite long coherence times, achieving uniform magnetic control remains a hurdle for scale-up due to challenges in high-frequency magnetic field control at the nanometre …

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Spin-Photon Coupling for Atomic Qubit Devices in Silicon

Edyta N. Osika, Sacha Kocsis, Yu‐Ling Hsueh, Serajum Monir et autres

Electrically addressing spin systems is predicted to be a key component in developing scalable semiconductor-based quantum-processing architectures, to enable fast spin-qubit manipulation and long-distance entanglement via microwave photons. However, single spins have no electric dipole, and therefore a spin-orbit mechanism must be …

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Spin-photon coupling for atomic qubit devices in silicon

Edyta N. Osika, Sacha Kocsis, Yu-Ling Hsueh, Serajum Monir et autres

Electrically addressing spin systems is predicted to be a key component in developing scalable semiconductor-based quantum processing architectures, to enable fast spin qubit manipulation and long-distance entanglement via microwave photons. However, single spins have no electric dipole, and therefore a spin-orbit mechanism …

Observation of Coulomb blockade in nanostructured epitaxial bilayer graphene on SiC

Cassandra Chua, Arseniy Lartsev, Jinggao Sui, Vishal Panchal et autres

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Observation of Coulomb blockade in nanostructured epitaxial bilayer graphene on SiC

Cassandra Chua, Arseniy Lartsev, Jinggao Sui, Vishal Panchal et autres

We study electron transport in nanostructures patterned in bilayer graphene patches grown epitaxially on SiC as a function of doping, magnetic field, and temperature. Away from charge neutrality transport is only weakly modulated by changes in carrier concentration induced by a local …

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Observation of Coulomb blockade in nanostructured epitaxial bilayer\n graphene on SiC

Cassandra Chua, Arseniy Lartsev, Jinggao Sui, Vishal Panchal et autres

We study electron transport in nanostructures patterned in bilayer graphene\npatches grown epitaxially on SiC as a function of doping, magnetic field, and\ntemperature. Away from charge neutrality transport is only weakly modulated by\nchanges in carrier concentration induced by a local side-gate. At low …