May 1 (Wed) @ 11:30am: ”Engineering, Control, and Integration of 2D Based Quantum Defects for Integrated Quantum Photonics,” Kamyar Parto, ECE PhD Defense

Zoom Meeting: https://ucsb.zoom.us/j/414638234

Abstract

Solid-state Quantum Emitters (SQEs) are an indispensable resource for quantum photonic platforms. These technologies can be made into compact and efficient modules by leveraging the mature silicon photonics ecosystem; however, suitable quantum emitters have not yet been demonstrated in silicon-based photonics. The development of CMOS-compatible, high-quality quantum emitters capable of on-demand single-photon generation could revolutionize the field of quantum information in the same way the laser has transformed global communications and high-speed data networks.

Two key requirements are necessary to address this challenge: (1) identification of emitters capable of high purity, high indistinguishability, and bright single-photon generation, and (2) the deterministic integration and alignment of such emitters with silicon-based photonic microcavities to achieve efficient on-chip emission. Many platforms have been developed to address the first challenge, including quantum dots, diamond color centers, and defects in two-dimensional materials . The second challenge has been more difficult to overcome and calls for a hetero-integrated approach that integrates materials hosting high-quality emitters into the silicon-photonic fabrication flow.

In recent years, the discovery of defect-based SQEs in 2D materials, most notably WSe2 and h-BN, has given a boost to this effort. In this talk, I will discuss our experiments that shed light on origin of SQEs and resulted in a novel method to site-specifically engineer SQEs in 2D materials with 50 nm spatial resolution, near unity yield, over 95% purity, and record-breaking working temperatures, Next, I'll discuss several advances in photonic integration that resulted in the development of a 2D-compatible photonic platform capable of >46% on-chip single-photon collection efficiency and > 95% single-photon purity at room temperature. This is the first demonstration of microcavity integration of quantum emitters in two-dimensional material emitters with silicon-based photonics, which improved the on-chip coupling efficiency by an order-of-magnitude over previous demonstrations.

Finally, I will provide an outlook to the future of this platform and specifically our progress to integrate our cavity-coupled SQEs into diode structures enabling electrical triggering of single-photons and prototyping the first on-chip quantum light emitting device (qLED).

Bio

Kamyar Parto is a Ph.D. candidate and Graduate Student Researcher in Quantum Photonics Lab (QPL) and the Nanoelectronic Research Lab (NRL) in the Department of Electrical and Computer Engineering at the University of California, Santa Barbara, advised by Prof. Galan Moody and Prof. Kaustav Banerjee. His doctoral research has chronicled in over 28 publications including seven first author papers published in journals including Nature Communications, PRX Quantum, and Nano Letters. He is also a recipient of several awards including the FiOLS Jean Bennet Memorial award, DOE SCGSR award, NSF Quantum Foundry Fellowship, and FiOLS Emil Wolf Finalist.

Hosted by: Prof. Galan Moody, Quantum Photonics Lab and Prof. Kaustav Banerjee, Nanoelectronics Lab

Submitted by: Kamyar Parto <kamyar00@ucsb.edu>