سخنرانی دکتر وحید اسفندیارپور با عنوان دستگاههای نوری غیرخطی به عنوان واسطه برای ارتباطات راه دور کوانتومی"
دانشگاه خاتم برگزار می کند:
Nonlinear optical devices as interfaces for long distance quantum communications
Today, the primary methods of communication are based on binary switches using digital logic in classical semiconductor devices. Quantum information processing enables superpositions of the binary states to evolve at the same time which is not possible in classical systems. A quantum computer can solve certain problems exponentially faster than classical computers. Quantum network consists of a number of quantum nodes which interacts with each other over a quantum channel while separated by some distances. The need for interfaces between quantum nodes and low-loss channels in long-distance quantum communication networks motivates the development of quantum frequency conversion (QFC) processes, in which a qubit’s carrier frequency is translated while its quantum state is maintained. This requires efficient and low-noise conversion of single photons. The use of periodically poled lithium niobate waveguides has enabled conversion efficiencies exceeding 99.99%. Therefore, reducing the generation rate of noise photons due to spontaneous scattering processes is important for these parametric single-photon conversion processes.
In this talk, I will discuss the influence of propagation loss on the optimal waveguide design, to reduce the required pump power for complete conversion of the input photons, resulting in a proportional reduction in the noise photons. I will also present a novel cascaded device for two-stage downconversion of single-photon-level signals at 650 nm to the low-loss telecom band with low excess noise and low required pump power as a quantum interface between matter qubit-based nodes and low-loss photonic channels for long-distance quantum communication networks.
دکتر وحید اسفندیارپور
Research Scientist, Stanford University
Vahid Esfandyarpour, PhD. is a research scientist in the department of applied physics at Stanford University. He received his B.S. degree in physics from Sharif university technology in 2010, and received his Master and PhD. in Electrical Engineering from Stanford University, 2012 and 2016. His PhD research was focused on quantum frequency converters for long distance quantum communication.
زمان: چهارشنبه 1395/8/26 ساعت ۹:۳۰ صبح
مکان: دانشگاه خاتم
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آدرس دانشگاه خاتم: تهران - خیابان ملاصدرا- خ شیراز شمالی - خ حکیم اعظم - پلاک ۳۰