通俗演講

2021/03/23(Tue)     14:00 -16:00    一樓演講廳1st Floor(auditorium)

Title

Toward On-Chip Photonic Quantum Computing Technology

Speaker

Dr. Yen-Hung Chen

Department of Optics and Photonics, National Central University

Abstract

Quantum photonics has progressed rapidly and becomes a rising technology for realizing many quantum devices and systems of great potential for, e.g., sensing, communications, information processing, and computing applications. Compared to the nowadays well-established and mature information and communication technology using classical bits, through the “spooky” quantum entanglement and superposition properties, quantum computers, though still in their very early developing stage, can provide a huge quantum parallelism to facilitate solving difficult/complex problems in an ultra-fast speed beyond the computation power of today's supercomputers. An important success is the most recent demonstrated quantum computational advantage using photons in performing the Boson sampling with the machine “Jiuzhang”.

A quantum bit (qubit) is the basic unit of quantum information used in quantum computing, playing a role like a classical binary bit in conventional computers but endowed with a super property by nature that allows the unit to be in a coherent superposition of the associated two (quantum) states simultaneously. In contrast to various qubits such as those from ion-trap and superconducting technologies, optical or photonic qubits are featured by many unique advantages, including workable at room temperature, compatible with CMOS, fiber-optic, and integrated-optic technologies, free from vacuum and magnetic systems, and scalable using such as multiplexing technology. These important features have led to abundant industrial and academic developments in integrated photonic quantum science and technology and have clearly manifested that photonic qubits are becoming a favorable and promising solution for quantum computing.

In this study, we explore the possibility and investigate enabling technologies of on-chip integration of photonic qubits (single photon source, entangled photon pair, and squeezed light), silicon photonic circuits, single-photon detectors, and leading-edge diode pump lasers to realize a robust, scalable quantum chip for computing. In this talk, we will also report our recent demonstration of Taiwan’s first integrated quantum photonic chips realized with a highly integrated heralded single photon source and a 2 qubits CNOT gate designed for the measurement-based computing. (Speaker Instroduction)