Alp Sipahigil (Advisor)

Research advised by BSAC Co-Director Alp Sipahigil

Sipahigil Group:  List of Projects | List of Researchers

Indistinguishable Photons from an Artificial Atom in Silicon Photonics

Lukasz Komza
Polnop Samutpraphoot
Mutasem Odeh
Yu-Lung Tang
Milena Mathew
Jiu Chang
Hanbin Song
Myung-Ki Kim
Yihuang Xiong
Geoffroy Hautier
Alp Sipahigil
2022

Silicon is the ideal material for building electronic and photonic circuits at scale. Spin qubits and integrated photonic quantum technologies in silicon offer a promising path to scaling by leveraging advanced semiconductor manufacturing and integration capabilities. However, the lack of deterministic quantum light sources, two-photon gates, and spin-photon interfaces in silicon poses a major challenge to scalability. In this work, we show a new type of indistinguishable photon source in silicon photonics based on an artificial atom. We show that a G center in a silicon waveguide can...

Polnop Samutpraphoot

Alumni
Electrical Engineering and Computer Sciences
Professor Alp Sipahigil (Advisor)
PostDoc 2022

Hanbin Song

Graduate Student Researcher
Materials Science & Engineering
Professor Alp Sipahigil (Advisor)
Ph.D. 2027 (Anticipated)

BSAC's Best: Fall 2022 Awards Announced

September 28, 2022

BSAC would like to thank all of the researchers who presented their research during BSAC's Fall 2022 Research Review on September 21st.

BSAC Industrial Members voted for the outstanding paper and presentations and the results are in. Please join BSAC in congratulating the recipients of the Fall 2022 Best of BSAC honors, Alex Moreno, Mutasem Odeh, and Vivian Wang!

Outstanding Presenter...

BPN966: Cryogenic Fiber Coupling for Silicon Quantum Photonics

Polnop Samutpraphoot
Lukasz Komza
Mutasem Odeh
Milena Mathew
Myung-Ki Kim
2022

We introduce a method for achieving high-efficiency and broadband fiber interfaces to silicon photonic devices at cryogenic temperatures, utilizing edge coupling between waveguides and lensed fibers. We will describe the simulation, design, and fabrication of single-sided waveguides featuring Bragg mirrors and tapered mode converter optimized for maximum photon collection from emitters in the devices. We then present fabrication techniques, including deep etching for edge coupling, as well as the experimental setup used to test our devices at cryogenic temperatures. Our method will...

BPN975: Suppressing Surface Piezoelectricity in Superconducting Circuits

Eric Li
Kadircan Godeneli
2022

Superconducting quantum circuits are one of the leading technologies for building quantum computers. These circuits are made of superconducting resonators with quality factors on the order of $10^5-10^6$. Because of the high device Q-factor when operating in the superconducting regime, loss mechanisms that would otherwise be insignificant to the overall resonator Q-factor start to become important. One such mechanism we explore in this project is the impact of surface piezoelectricity on qubit and resonator quality factors. Surface piezoelectricity arises due to atomic dipoles...

Eric Li

Alumni
Electrical Engineering and Computer Sciences
Professor Alp Sipahigil (Advisor)
B.S. 2022

Lukasz Komza

Graduate Student Researcher
Physics
Professor Alp Sipahigil (Advisor)
Ph.D. 2026 (Anticipated)

Lukasz Komza is a Physics PhD student at the University of California, Berkeley. He started working with Alp Sipahigil in the Quantum Devices Group in 2021 on the characterization and integration of silicon qubits in photonics. Prior to starting his PhD, Lukasz interned at Bell Labs in Murray Hill, NJ, working with Michael Eggleston on optical coherence tomography. He studied quantum light sources in 2D materials with Stefan Strauf during his undergraduate education, where he received the Alfred M. Mayer prize.

Kadircan Godeneli

Graduate Student Researcher
Electrical Engineering and Computer Sciences
Professor Alp Sipahigil (Advisor)
Ph.D. 2026 (Anticipated)
Kadircan received his B.S. degrees in Electrical Engineering and Physics from Bogazici University, Istanbul, Turkey in 2021. He is currently pursuing a Ph.D. in the Quantum Devices Group at UC Berkeley under the supervision of Prof. Alp Sipahigil.