Research
Introduction: Quantum Information Science
Quantum Information Science explores the application of quantum mechanics to information processing and communication, unlocking new possibilities that go beyond the capabilities of classical systems. The non-classical aspects of quantum mechanics play a crucial role in the potential of quantum information processing:
Quantum Superposition: Classical bits (unit of computation) can exist in one of two logical states, 0 or 1. In contrast, quantum bits or qubits can exist in a superposition of both 0 and 1 simultaneously, e.g., |0⟩ + |1⟩.
Quantum Entanglement: When two or more qubits become entangled, the state of one qubit becomes strongly dependent on the state of another and the wavefunction takes a non-separable form, e.g. |00⟩ + |11⟩. In this case, changes to the state of one qubit from a local projective measurement instantaneously affect the state of the entangled qubit.
Figure from KIAS HORIZON [Link]
We are currently in an exciting era where the progress in quantum information science is reshaping our understanding of physical phenomena and redefining the landscape of future computations. To summarize some of the interesting developments in the field:
Quantum Hardware: Quantum hardware platforms, based on various physical systems, are being developed for applications in quantum information technology. These platforms not only include systems based on natural quantum particles such as photons, ions, and atoms but also artificially engineered quantum systems such as superconducting qubits and quantum dots.
Quantum Industry: Numerous initiatives within the industry are actively pursuing the development of quantum computers and the exploration of practical applications, including efforts towards commercialization, of quantum technologies. This movement is spearheaded not only by major tech corporations such as IBM, Google, Microsoft, and Amazon but also by emerging startup enterprises.
Quantum Supremacy (or Quantum Advantage): Despite its controversial nature, contemporary quantum computers have demonstrated success in performing tasks that are practically impossible for even the most powerful classical computers within a reasonable timeframe. Although these accomplishments have been confined to tasks of limited practical utility, witnessing proof-of-principle demonstrations of quantum advantage remains intriguing.
Research Highlights
Our lab studies engineered quantum systems based on mesoscopic devices and their applications to quantum information and quantum computation. Specifically, we study novel quantum optical, topological, and many-body phenomena by utilizing superconducting quantum circuits—a promising candidate platform for realizing a universal quantum computer. To briefly introduce our methodology:
Our mission is to pioneer the development of innovative quantum hardware, leveraging novel advantages to address the challenges posed by noisy intermediate-scale quantum devices. In pursuit of this objective, we aspire to actively contribute to the exploration of new physics and the advancement of practical quantum technologies.
For further details of our research projects, refer to the following pages (will be updated soon):
Waveguide Quantum Electrodynamics
Novel Quantum Hardwares
Microwave Quantum Photonics
Many-Body Physics