[Dec. 5] Physics Special Seminar - Dr. Eun-Jong Kim (CALTECH)

물리학과 특별세미나 개최 안내

물리학과에서는 특별세미나를 아래와 같이 개최하오니 관심있는 분들의 많은 참석을 바랍니다.

1. 연사: 김은종 박사 (CALTECH)

2. 일시: 2022. 12. 5(월), 오후 4시 30분
3. 장소: 공학3동 302호 (세미나실)

4. 제목: Probing Many-Body Quantum Phenomena with Long-Range-Interacting Superconducting Quantum Devices

Experimental realizations of engineerable quantum systems—quantum simulators—provide insights into exotic quantum many-body concepts that are intractable with available classical methods. A key challenge in the development of modern quantum simulators is to maintain the level of connectivity and control during scale-up. While majority of scalable quantum simulation and computation architectures to date feature nearest-neighbor interactions limited by their local nature of coupling, long-range interacting quantum systems—exhibiting fast build-up of quantum correlation and entanglement—provide new approaches for studying quantum many-body phenomena and investigating quantum error-correction schemes in the near term. Utilization of extensible quantum bus such as a photonic waveguide provides a natural direction to investigate such many-body quantum systems where qubits interact non-locally by exchange of photons along the bus.

Following this idea, I will introduce our efforts toward constructing scalable superconducting quantum simulators with long-range connectivity and individual addressing. I will focus on two approaches for channeling photon-mediated interactions between qubits: (i) when the qubits are tuned inside photonic bands of a waveguide channel [1] and (ii) when the qubits are tuned inside bandgaps of photonic metamaterials [2]. Highlighting the advantages and limitations of these schemes, I will discuss experiments performed in such simulators at the scale of ten qubits. Our work enables realization of various regimes in many-body quantum dynamics, and more broadly, provides a novel class of accessible Hamiltonians for analog quantum simulation in superconducting circuits [3].

[1] M. Mirhosseini*, E. Kim* et al., Nature 569, 692-697 (2019)

[2] X. Zhang*, E. Kim* et al., arXiv:2206.12803 (2022)

[3] E. Kim*, X. Zhang* et al., Phys. Rev. X 11, 011015 (2021)