2018 Fall Physics Colloquium
강연일자: 2018. 9. 4. 화 오후 5시
장소: 아산이학관 433호
강연자: 안재욱 (KAIST 물리학과)
강연주제: Making a quantum computer
Quantum computing has developed, during the last two decades, from a visionary idea to one of the most fascinating areas of modern physics and also a most impactful future technology. Scientist around the world are racing to construct a quantum computer, encountering numerous unheard-of technical problems involved with the quantum nature of candidate physical systems (the massively entangled quantum many-body systems). Our research has been focused on Rydberg-atom assemblages: Rydberg atoms are atoms with a high principal quantum number, so are huge in size (typically a few micrometer) compared to the "usual" atoms in the near-ground state; hence, these atoms can be strongly coupled to each other (entangled), even when they are a few micrometer apart (optically addressable distance). Our system traps up to N=40 single (rubidium) atoms using the lately invented so-called tweezer atom traps (2N number of optical tweezers are rearranged to make a zeroentropy array of N single atoms). Being excited to a Rydberg energy state in the Rydberg-dipole blockade regime, these atoms make an entangled N particle system. We investigate how to actively control this massivelyentangled quantum system (Rydberg atom assemblage) to perform quantum computation (more precisely quantum simulation in our current stage). Thanks to the advantages of easy addressability and easy scaling (up to a few hundreds), Rydberg-atom approach can be a potential (hopefully) game changer in quantum computation. In this talk, we will present the latest developments of our Rydberg-atom quantum computer.