Quantum computing has been in the news a lot lately. Conjectured in the ‘80s, with seminal motivating algorithmic and error correction discoveries in the 90s, the physics behind a quantum computer—qubit technology—has progressed steadily over the last two decades. Small, research-scale quantum computers with 10s of qubits are …

After almost two-decades of sustained effort in making spin- based qubits, silicon still has great promise as the technology of choice for future quantum computers.After a brief update on the field, I will discuss our recent work proposing new qubit and coupling approaches for silicon quantum dots that attempt …

We present a theory for understanding the exchange interaction between electron spins in neighboring quantum dots, either by changing the detuning of the two quantum dots or independently tuning the tunneling barrier between quantum dots. The Hubbard model and a more realistic confining-potential model are used to investigate how the …

After almost two-decades of sustained effort in making spin-based qubits, silicon still has great promise as the technology of choice for future quantum computers. After a brief update on the field, I will discuss our recent work proposing new qubit and coupling approaches for silicon quantum dots that attempt to …

Career talk covering my experiences from graduate student to internal postdoc to seta to government.

iQuise student team talk, MIT, Boston, MA

Future quantum computers may utilize multiple types of encoded spin qubits each optimized for their role within the system, be it computation, communication, initialization, or readout. In this talk I will discuss a new encoded qubit, the so-called “always-on, exchange-only” (AEON) qubit, which offers a true sweet spot to charge …

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 …