Program
Full Program | Thursday | Friday | Saturday | All Sessions | Posters | Talks
SESSION 4: Semiconductor qubits (experiment) (Pavilion I - III)Chair: Emily Pritchett (HRL) | |
| 3:45 pm - 4:30 pm | Stephanie Simmons, (Simon Fraser) Illuminating a path forward for silicon donor spin qubits | Abstract. When it comes to silicon donor-based quantum computation, the most pressing concern is the lack of reliable two-qubit interactions. Silicon donor qubits otherwise match or outperform many qubit rivals, by offering hours-long coherence times in the bulk and >99.9% simultaneous fidelities for single-qubit initialization, manipulation and readout. Moreover, they offer these attributes in a CMOS-compatible platform, which is ripe for future rapid commercialization. In this talk I will introduce an approach to measure and connect donor qubits photonically. This approach should be robust to device environments with variable strains and electric fields, and will allow for CMOS-compatible, bulk-like, spatially separated donor qubit placement, parity measurements, and 4.2K operation. I will present preliminary data in support of this approach, including 4.2K optical readout in Earth's magnetic field, where long T1/T2 times have been measured. |
| 4:30 pm - 5:00 pm | Patrick Harvey-Collard, Carroll group (Sandia) Nuclear-driven electron spin rotations in a coupled silicon quantum dot and single donor system | Abstract. Single donors in silicon are very good qubits. However, a central challenge is to couple them to one another. To achieve this, many proposals rely on using a nearby quantum dot (QD) to mediate an interaction. In this talk, I will demonstrate the coherent coupling of electron spins between a single 31P donor and an enriched 28Si metal-oxide-semiconductor few-electron QD. I show that the electron-nuclear spin interaction can drive coherent rotations between singlet and triplet electron spin states. Moreover, the exchange interaction between the QD and donor electrons can be tuned electrically. The combination of single-nucleus-driven rotations and voltage-tunable exchange provides all elements for future all-electrical control of a spin qubit, and requires only a single dot and no additional magnetic field gradients. These results represent a key step in the realization of multi-donor qubit systems. It also generates exciting new possibilities for nuclear spin qubits. This work was performed, in part, at the Center for Integrated Nanotechnologies, an Office of Science User Facility operated for the U.S. Department of Energy (DOE) Office of Science. Sandia National Laboratories is a multi-program laboratory managed and operated by Sandia Corporation, a wholly owned subsidiary of Lockheed Martin Corporation, for the U.S. DOE's National Nuclear Security Administration under contract DE-AC04-94AL85000. |
SQuInT Chief Organizer
Prof. Akimasa Miyake
amiyake@unm.edu
SQuInT Co-Organizer
Prof. Elohim Becerra
fbecerra@unm.edu
SQuInT Founder
Prof. Ivan Deutsch
ideutsch@unm.edu
SQuInT Administrator
Gloria Cordova
gjcordo1@unm.edu
505 277-1850
