Alp Sipahigil (Advisor)

Research advised by BSAC Co-Director Alp Sipahigil

BPN996: Reconfigurable Photonic Crystal Cavity Array (New Project)

Yu-Lung Tang
Lukasz Komza
Hanbin Song
Yiyang Zhi
Xueyue (Sherry) Zhang
2023

Photonics resonator arrays have been shown as building blocks in various aspects such as information processing, sensing, metamaterials, nonlinear optics, and optomechanics. Photonics crystal cavities are especially useful in quantum computation to Purcell enhance the optical emission rate of quantum emitters, owing to their high-quality factor and small mode volume. However, due to fabrication disorder, post-fabrication tuning methods are required and limit the controllability of photonic crystal cavities. In this project, we will address this challenge by designing a bus...

Wei-Yu Lin

Graduate Student Researcher
Electrical Engineering and Computer Sciences
Professor Alp Sipahigil (Advisor)
Ph.D. 2029 (Anticipated)

BPN997: Probing Surface Piezoelectricity with Surface Acoustic Waves (New Project)

Haoxin Zhou
Kadircan Godeneli
Zihuai Zhang
Mutasem Odeh
2023

Piezoelectricity is the ability of certain materials to generate an electric polarization in response to applied mechanical stress or generate a mechanical deformation in response to applied voltage. It has broad applications where transduction between electrical and mechanical energy is required. It may also play a negative role and affect the performance of electronic devices. An example is the piezoelectric loss in superconducting qubits. While bulk piezoelectricity usually only exists in materials without inversion symmetry, theoretical calculation predicted that the...

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...

BPN989: Defect-Induced Piezoelectricity in Silicon

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. For example, one common approach to realize electromechanics in silicon relies on hybrid integration with a different...

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...

BPN980: Spin-Photon Interfaces in Silicon Photonics

Hanbin Song
Yiyang Zhi
Xueyue (Sherry) Zhang
Lukasz Komza
Yu-Lung Tang
2023

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...

Yu-Lung Tang

Graduate Student Researcher
Physics
Professor Alp Sipahigil (Advisor)
Ph.D. 2028 (Anticipated)

Yu-Lung Tang is a Physics PhD student at the University of California, Berkeley. He started working with Alp Sipahigil in the Quantum Devices Group in July 2022 on the characterization of Silicon color center in integrated photonics.