Joe Salfi

Krylov Break Times from an Inhomogeneous Lieb--Robinson Light Cone

Shunji Matsuura, Yoji Kawamura, Joe Salfi, Satoshi Iso

Krylov and Lanczos approximations are used in quantum dynamics, quantum subspace methods, and Hamiltonian learning. A practical question is how long an $m$-dimensional Krylov truncation can be trusted. We argue that this time is fixed by causal propagation on the associated Jacobi …

Robust microwave-optical photon conversion using cavity modes strongly hybridized with a color center ensemble

M. Khalifa, P. S. Kirwin, Jeff F. Young, Joe Salfi

A microwave-optical converter with high efficiency (>50%) and low added noise ( ≪ 1 photon) could enable the creation of scalable optical quantum networks. However, integrated converters demonstrated to date are too lossy or weakly non-linear to provide this performance. Here we …

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Robust Microwave-Optical Photon Conversion Using Cavity Modes Strongly Hybridized with a Color Center Ensemble

Mohamed Khalifa, P. S. Kirwin, Jeff F. Young, Joe Salfi

A microwave-optical photon converter with high efficiency ($>50$ %) and low added noise ($\ll 1$ photon) could enable the creation of scalable quantum networks where quantum information is distributed optically and processed in the microwave regime. However, integrated converters demonstrated to date …

Isotopically pure 70Ge/28Si70Ge heterostructures grown on SiGe-buffered Si wafers

Patrick Daoust, Nicolas Rotaru, Alexis Dubé-Valade, Sebastian Koelling et autres

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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Cryogenic optical-to-microwave conversion using Si photonic integrated circuit Ge photodiodes

D. Julien-Neitzert, Edward Leung, Sergey V. Khorev, Sudip Shekhar et autres

Integrated circuit technology enables the scaling of circuit complexity and functionality while maintaining manufacturability and reliability. Integration is expected to play an important role in quantum information technologies, including in the highly demanding task of producing the classical signals to control and …

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Cryogenic Optical-to-Microwave Conversion Using Si Photonic Integrated Circuit Ge Photodiodes

D. Julien-Neitzert, Eric Cheuk Wing Leung, Naz E. Islam, S. Khorev et autres

Integrated circuit technology enables the scaling of circuit complexity and functionality while maintaining manufacturability and reliability. Integration is expected to play an important role in quantum information technologies, including in the highly demanding task of producing the classical signals to control and …

Towards Readout-Aware Layout Synthesis for Spin Qubit Systems with Double Quantum Dot Readouts

Ritu Thombre, Marcus Edwards, Joe Salfi, Olivia Di Matteo

A quantum compiler is required to run a quantum circuit on a quantum computer, similar to how classical compilers are required to run programs on classical computers. Spin qubits are a promising candidate for scalable quantum computers. General-purpose quantum compilers can be …

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Kinetic inductance parametric converter

M. Khalifa, Polina Feldmann, Joe Salfi

Parametric converters are parametric amplifiers that mix two spatially separate nondegenerate modes and are commonly used for amplifying and squeezing microwave signals in quantum computing and sensing. In Josephson parametric converters, the strong localized nonlinearity of the Josephson junction limits the amplification …

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Electrical operation of planar Ge hole spin qubits in an in-plane magnetic field

Abhikbrata Sarkar, Zhanning Wang, M. J. Rendell, Nico W. Hendrickx et autres

Hole spin qubits in group-IV semiconductors, especially Ge and Si, are actively investigated as platforms for ultrafast electrical spin manipulation thanks to their strong spin-orbit coupling. Nevertheless, the theoretical understanding of spin dynamics in these systems is in the early stages of …

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Electrical operation of planar Ge hole spin qubits in an in-plane magnetic field

Abhikbrata Sarkar, Zhanning Wang, Nico W. Hendrickx, Menno Veldhorst et autres

In this work we present a comprehensive theory of spin physics in planar Ge hole quantum dots in an in-plane magnetic field, where the orbital terms play a dominant role in qubit physics, and provide a brief comparison with experimental measurements of …

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A solid-state quantum microscope for wavefunction control of an atom-based quantum dot device in silicon

B. Voisin, Joe Salfi, Dominique Didier St Medar, Brett C. Johnson et autres

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