Talks

July 16 (Tue)


Time: 11:00 - 12:00

Title: Quantum data processing inequality and approximate quantum error correction

Abstract: In this lecture, we will explore quantum error correction from an information-theoretical viewpoint. First, we will derive an approximate quantum error correction condition in terms of the change in coherent information. Second, we will study the quantum data processing inequality, which states that coherent information is non-increasing under a quantum channel, analogous to the second law of thermodynamics. Finally, we will relate the quantum data processing inequality to its recovery property, leading to a tighter condition on quantum error correction.


Time: 12:10 - 13:50


Time: 14:00 - 15:00

Title: Quantum data processing inequality and approximate quantum error correction

Abstract: In this lecture, we will explore quantum error correction from an information-theoretical viewpoint. First, we will derive an approximate quantum error correction condition in terms of the change in coherent information. Second, we will study the quantum data processing inequality, which states that coherent information is non-increasing under a quantum channel, analogous to the second law of thermodynamics. Finally, we will relate the quantum data processing inequality to its recovery property, leading to a tighter condition on quantum error correction.


Time: 15:10 - 15:30

Title: Entanglement and Holography

Abstract: TBA


Time: 15:30 - 16:30

Title: Multipartite Entanglement in Quantum Information and Holography

Abstract: Bipartite entanglement has been extensively studied through measures such as entanglement entropy and entanglement negativity. In contrast, the notion of multipartite entanglement is more nuanced and and holds immense significance for quantum teleportation and quantum communication. In this talk, we will delve into the concept of multipartite entanglement and explore proposed measures to quantify it in both Quantum Information (QI) and Holography.We begin with a brief overview of Local Operations and Classical Communication (LOCC) and Stochastic Local Operations and Classical Communication (SLOCC). We will then discuss a significant contribution made by Cirac et al. who classified three-qubit states using SLOCC. Their investigation revealed two inequivalent classes of genuine tripartite entangled states in the three-qubit case, represented by the W and GHZ states. The complexities involved in categorizing higher-party entanglement will be highlighted. Following this, some existing measures for multipartite entanglement in the Quantum Information literature will be reviewed. 

In the second part of the talk I will introduce novel measures such as Multi-entropy and L-entropy, explaining their relevance in characterizing multipartite entanglement in Quantum Field Theories (QFTs). Furthermore, we will explore how to compute Multi-entropy and L-entropy using their geometric duals in holography. I will conclude by discussing the vast potential for exploration in the interplay between quantum information and holography, which sheds new light on the profound connection between multipartite entanglement and the structure of spacetime.


Time: 17:00 - 18:00

Title: Hayden-Preskill protocol from a quantum information perspective

Abstract: This lecture is about a pedagogical overview of the Hayden-Preskill protocol. Although it is by-now-classic, we will focus on the quantum-information-theoretic mechanisms underlying the protocol. I will begin with the basic setting and intuitively explain how the protocol works. Additionally, we will discuss various related topics, such as the role of energy conservation (2007.00895), decoding classical information (2210.06661), and explicit decoders in more general situation (2405.06051), as far as time permits.

Lecture Note: [Link]

July 17 (Wed)


Time: 11:00 - 12:00

Title: Hayden-Preskill protocol from a quantum information perspective

Abstract: This lecture is about a pedagogical overview of the Hayden-Preskill protocol. Although it is by-now-classic, we will focus on the quantum-information-theoretic mechanisms underlying the protocol. I will begin with the basic setting and intuitively explain how the protocol works. Additionally, we will discuss various related topics, such as the role of energy conservation (2007.00895), decoding classical information (2210.06661), and explicit decoders in more general situation (2405.06051), as far as time permits.

Lecture Note: [Link]


Time: 13:00 - 14:00


Time: 14:00 - 15:00

Title: Graphical approaches to quantum information processing

Abstract: This lecture introduces graphical methods used in quantum information and computation science, which provide visual insights to underpin fundamental quantum phenomena and verify optimal schemes for quantum computing. My lecture is divided into two parts: 


Time: 15:30 - 16:30

Title: Von Neumann algebras: Classification and some applications in quantum information

Abstract: TBA


Time: 17:00 - 18:00

Title: Quantum measurement and classical-quantum interactions

Abstract: In this presentation, we provide an overview of the principles of quantum measurements and the dynamics of classical-quantum hybrid systems. In the first part of the talk, we address the abstract construction of the theory of quantum measurements and establish the canonical quantum measurement scheme. We then examine a classical-quantum interacting system to illustrate the information process from a quantum system to a classical register. This presentation may be followed by a discussion on the dynamic model of classical gravity coupled to quantum fields.

July 18 (Thu)


Time: 11:00 - 12:00

Title: Graphical approaches to quantum information processing

Abstract: This lecture introduces graphical methods used in quantum information and computation science, which provide visual insights to underpin fundamental quantum phenomena and verify optimal schemes for quantum computing. My lecture is divided into two parts: 


Time: 13:00 - 14:00


Time: 14:00 - 15:00

Title: Quantum measurement and classical-quantum interactions

Abstract: In this presentation, we provide an overview of the principles of quantum measurements and the dynamics of classical-quantum hybrid systems. In the first part of the talk, we address the abstract construction of the theory of quantum measurements and establish the canonical quantum measurement scheme. We then examine a classical-quantum interacting system to illustrate the information process from a quantum system to a classical register. This presentation may be followed by a discussion on the dynamic model of classical gravity coupled to quantum fields.