Alp Sipahigil (Advisor)

Research advised by BSAC Co-Director Alp Sipahigil

Phonon-Protected Superconducting Qubit

Mutasem Odeh
2022
Fall 2022 BSAC Research Review Presentation View Slides View Presentation at 10:05 BSAC Best Paper - Spring 2023

Xueyue (Sherry) Zhang

Postdoctoral Researcher
Electrical Engineering and Computer Sciences
Professor Alp Sipahigil (Advisor)

Zihuai Zhang

Postdoctoral Researcher
Electrical Engineering and Computer Sciences
Professor Alp Sipahigil (Advisor)

Zihuai is a postdoctoral researcher in Prof. Alp Sipahigil's group, working on solid-state quantum systems. He earned his Ph.D. in electrical and computer engineering in 2022 from Princeton University, where he worked on engineering coherent quantum defects in diamond in the lab of Prof. Nathalie de Leon. He received his B.S. in physics in 2016 from University of Science and Technology of China.

BPN981: Suppressing Energy Losses in Compact Superconducting Qubits

Kadircan Godeneli
Mutasem Odeh
Eric Li
2022

State-of-the-art quantum computers currently have qubit gate error rates that are too large for practical computing. Quantum error correction can protect computations from physical errors by encoding logical qubits in many physical qubits. However, physical qubit error rates need to be sufficiently low to minimize resource overhead and suppress errors. As a result, compact qubit designs with small dissipation and error rates are crucial to scaling up a fault-tolerant quantum computer. In this project, we aim to address the scaling up of superconducting quantum processors by...

BPN980: Spin-Photon Interfaces in Silicon Photonics

Hanbin Song
Lukasz Komza
Yu-Lung Tang
Yiyang Zhi
2022

Color centers in silicon have recently shown their potential as telecom-band single photon emitters with high scalability and compatibility with silicon photonics. The silicon color centers investigated so far, however, are not suitable for quantum computation and communication applications which require quantum memories for storing and processing quantum information transmitted by photons. Such quantum memories can be implemented using the electron and nuclear spins of color centers that provide long-lived quantum states. In this project, we are investigating new color centers that...

BPN967: Indistinguishable Photons from Quantum Emitters in Silicon Photonics

Lukasz Komza
Yu-Lung Tang
Hanbin Song
Zihuai Zhang
2023

The G center, an atom-like single-photon emitter in silicon, has emerged as a promising candidate for realizing a quantum-coherent light source in integrated photonics. Our recent work demonstrating two-photon quantum interference with a single waveguide-integrated G center highlights the utility of G centers for photonic quantum information applications. However, improvements in the optical coherence properties of the G center must be achieved to enable its technological implementation. We will address this challenge by leveraging the integration capabilities of the silicon platform...

BPN965: Phonon Protected Superconducting Qubits

Mutasem Odeh
Kadircan Godeneli
2023

Superconducting quantum circuits are leading candidates for quantum computing. Scaling up these systems for practical applications will require compact coherent qubits that store the quantum states, high fidelity quantum gates that process them, and a scalable architecture that can accommodate complex error correction circuits. Meeting such requirements is mainly impeded by the unavoidable presence of two-level systems (TLS), which act as a decoherence source that results in the loss of quantum information via phonon emission. In this project, we engineer superconducting circuits...

BPN989: Defect-Induced Piezoelectricity in Silicon (New Project)

Zihuai Zhang
Kadircan Godeneli
2023

Silicon, a mature platform for the semiconductor industry, has become a leading platform for future quantum technologies. As a high-purity material, it serves as a low-noise host for a variety of quantum defects. As a low-loss material, it is a desirable substrate and material platform for next generation quantum devices. However, the lack of piezoelectricity in silicon, due to its centro-symmetric structure, poses challenges for its electromechanical applications. In this project, we aim to engineer strong piezoelectric response in silicon using the atomic coherence of acceptor dopants....

Haoxin Zhou

Postdoctoral Researcher
Electrical Engineering and Computer Sciences
Professor Alp Sipahigil (Advisor)

Haoxin Zhou is a postdoctoral researcher working with Alp Sipahigil in the Quantum Devices Group in UC Berkeley. His research focuses on superconducting microwave circuits and nanomechanical devices. Prior joining UC Berkeley, he worked as an IQIM Postdoctral Scholar at the California Insitute of Technology. He obtained his PhD in Physics from the University of California, Santa Barbara in 2021 and B.S. from the University of Science and Technology of China in 2015.