We theoretically model the spin-orbit interaction in silicon quantum dot devices, relevant for quantum computation and spintronics. Our model is based on a modified effective mass approach with spin-valley boundary conditions, derived from the interface symmetry under presence of perpendicular to the interface electric field. The g-factor renormalization in the …

We investigate coupling an encoded spin qubit to a microwave resonator via qubit energy level curvature versus gate voltage. This approach enables quantum non-demolition readout with strength of tens to hundred MHz all while the qubit stays at its full sweet-spot to charge noise, with zero dipole moment. A “dispersive-like …

We investigate a hybrid quantum system consisting of spatially separated resonant exchange qubits, defined in three-electron semiconductor triple quantum dots, that are coupled via a superconducting transmission line resonator. Drawing on methods from circuit quantum electrodynamics and Hartmann-Hahn double resonance techniques, we analyze three specific approaches for implementing resonator-mediated two-qubit …

I will talk about two of our recent proposals for quantum computers based on superconducting JJ circuits [1] and spins in semiconductors [2]: what motivated them, why they are worth pursuing experimentally, and directions for future research.

[1] Semiconductor-inspired design principles for superconducting quantum computing, Nature Communications 7, 11059 (2016 …

We introduce an always-on, exchange-only (AEON) qubit made up of three localized semiconductor spins that offers a true “sweet spot” to fluctuations of the quantum dot energy levels. Both single- and two-qubit gate operations can be performed using only exchange pulses while maintaining this sweet spot. We show how to …

Information technology based on the fundamental nature of the universe, namely quantum physics, can in some cases dramatically outperform the best “classical” solution. In other words, a quantum computer will be important someday. But the challenges are still immense. Somewhat surprisingly, silicon may continue to be an exceptionally relevant material …

We investigate a hybrid quantum system consisting of spatially separated resonant exchange qubits, defined in three-electron semiconductor triple quantum dots, that are coupled via a superconducting transmission line resonator. Drawing on methods from circuit quantum electrodynamics and Hartmann-Hahn double resonance techniques, we analyze three specific approaches for implementing resonator-mediated two-qubit …

Although the properties of spin-based qubits are specified by the material system they reside in, it’s possible to modify those properties by encoding a qubit into multiple physical spins. Here we consider new operating regimes for encoded spin qubits and discuss their relevance to spin-based quantum computing and qubit-qubit …

Talks

B45.00002 A new look at encoded-qubit quantum dot quantum computing in silicon

E45.00007 Spin-cavity longitudinal coupling for two-qubit gates and measurement

K45.00007 Entangling distant resonant exchange qubits via circuit quantum electrodynamics

K48.00008 Semiconductor-inspired superconducting quantum computing

Organized/Chaired

A13 Quantum Characterization, Verification and Validation

We introduce an always-on, exchange-only qubit made up of three localized semiconductor spins that offers a true “sweet spot” to fluctuations of the quantum dot energy levels. Both single- and two-qubit gate operations can be performed using only exchange pulses while maintaining this sweet spot. We show how to interconvert …