Alp Sipahigil (Advisor)

Research advised by BSAC Co-Director Alp Sipahigil

Sipahigil Group:  List of Projects | List of Researchers

Phonon-Protected Superconducting Qubits

Mutasem Odeh
Alp Sipahigil
2023

The overhead to construct a logical qubit from physical qubits rapidly increases with the de- coherence rate. Current superconducting qubits reduce dissipation due to two-level systems (TLSs) by using large device footprints. However, this approach provides partial protection, and results in a trade-off between qubit footprint and dissipation. This work introduces a new platform using phononics to engineer superconducting qubit-TLS interactions. We realize a superconducting qubit on a phononic bandgap metamaterial that suppresses TLS- mediated phonon emission. We use the qubit to probe its...

Mutasem Odeh

Graduate Student Researcher
Electrical Engineering and Computer Sciences
Professor Alp Sipahigil (Advisor)
Ph.D. 2023

I am currently a Graduate student in the EECS department at UC Berkeley, working with Prof. Alp Sipahigil on developing Quantum Hardware. I have a background in the design and fabrication of integrated photonics and metamaterial structures along with industrial experience in electronics and photonic design.

Programmable Photonic Crystal Arrays

Yu-Lung Tang
2023
Fall 2023 BSAC Research Review Presentation View Presentation View Slides Project: BPN996 - Sipahigil Group

BPN967: 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...

Shahin Jahanbani

Graduate Student Researcher
Physics
Professor Alp Sipahigil (Advisor)
Ph.D. 2029 (Anticipated)

Shahin Jahanbani is a Physics PhD student in the group of Alp Sipahigil at the University of California, Berkeley. His current research involves the development and characterization of quantum phononics platforms. He graduated Phi Beta Kappa with Special Departmental Honors in Physics and Highest Honors in Physics and Astronomy from the University of Texas at Austin, earning his BS in Physics, BS in Astronomy, and certificate in quantum information science. His undergraduate research involved the investigation of topological phononics, MEMS devices, and quantum materials with...

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.

BSAC Spring 2023 Research Review Presenter

Defect-Induced Piezoelectricity in Silicon

Zihuai Zhang
2023
Spring 2023 BSAC Research Review Presentation View Slides View this Presentation at 07:55

 Project: BPN989 - Alp Sipahigil Group

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)

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...