Integrated Quantum Photonic Chip Technology for Computing

Yen-Hung Chen^1*, Ray-Kuang Lee², Ming-Chang Lee², Chih-Sung Chuu³, Tien-Chang Lu⁴, Po-Tsung Lee⁴, Yi-Shan Lee⁵, Shin-Tza Wu⁶, Ching-Yi Lai⁷

¹Department of Optics and Photonics, National Central University, Jhongli 320, Taiwan
²Institute of Photonics Technologies, National Tsing Hua University, Hsinchu 30013, Taiwan
³Department of Physics, National Tsing Hua University, Hsinchu 30013, Taiwan
⁴Department of photonics, National Chiao Tung University, Hsinchu 30013, Taiwan
⁵Department of Electrical Engineering, National Central University, Jhongli 320, Taiwan
⁶Department of Physics, National Chung Cheng University, Chiayi 621301, Taiwan
⁷Institute of Communications Engineering, National Chiao Tung University, Hsinchu 30013, Taiwan

* Presenter:Yen-Hung Chen

Quantum photonics has progressed rapidly and becomes a rising technology for realizing many quantum devices and systems advantageous for, e.g., sensing, communications, information processing, and computing applications. Compared to the mature development in information and communication technology with classical bits, through quantum superposition and quantum entanglement, quantum computers have provided a huge quantum parallelism, resulting in solving problems in an ultra-fast speed beyond the computation power of today's supercomputers. An important example 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 integrate our expertise on the technologies of photonic qubits (single photon source, entangled photon pair, and squeezed light), silicon photonics, single-photon detectors, leading-edge diode pump lasers, and quantum codes to realize scalable silicon-based quantum chips with the ability to perform fault-tolerant quantum computation at room temperature. In this talk, we will focus on our recent demonstration of Taiwan’s first integrated quantum photonic chip realized with a highly integrated entangled light source and a 2 qubits CNOT gate designed for the measurement-based computing.

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