Atomic Physics Seminars |
Events During the Week of February 12th through February 19th, 2023
Monday, February 13th, 2023
- The geometry of quantum error correction under biased noise
- Time: 11:00 am - 12:00 pm
- Place: 5310 Chamberlin Hall
- Speaker: Arpit Dua
- Abstract: Quantum error correction is necessary because physical qubits have much higher error rates per gate operation than are needed for practical tasks. The popular choice is to encode a logical qubit in a large enough planar layout of many physical qubits, called the surface code, to have sufficiently low logical error rates. The optimal logical error rates depend on the statistical mechanics of logical operators. For example, under biased Pauli noise, having more higher-weight logical operator representations with a higher ratio of low-rate Pauli operators is better. Using this idea, I will discuss how, in active error correction, measuring Clifford-rotated Pauli stabilizers of the surface code can enhance code performance: higher error thresholds and lower subthreshold logical error rates, for biased Pauli noise. Using statistical mechanics and percolation theory, I will describe a phase diagram of 50% thresholds for random Clifford-rotated surface codes under pure dephasing noise. Using tensor network numerics, I will show that certain families of these random codes outperform the best-known translation invariant Clifford-rotated surface codes for finitely biased depolarizing noise.
- Host: Thad Walker
Tuesday, February 14th, 2023
- No events scheduled
Wednesday, February 15th, 2023
- Achieving Practical Computations on Quantum Computers: From Better Qubits to Better Algorithms
- Time: 11:00 am - 12:00 pm
- Place: 5310 Chamberlin Hall
- Speaker: Matthew Otten , Hughes Research Laboratories
- Abstract: Quantum information science holds the potential to revolutionize computation, communication, and sensing. Despite recent progress, significant challenges remain to make quantum technology practical and scalable. In this talk, I will highlight my research on simulating open quantum systems, benchmarking quantum devices, and developing efficient quantum algorithms. I will also discuss the physics of different qubits, methods for characterizing and verifying them, and quantum algorithms for chemistry. Finally, I will outline my plans to tackle the remaining challenges and bring practical quantum computing closer to reality.
- Host: Thad Walker
Thursday, February 16th, 2023
- No events scheduled
Friday, February 17th, 2023
- No events scheduled