150 citations · 1.2k across the 40 of their papers we have counts for
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Entanglement Requires Fluctuations at Conformal Interfaces
Yuya Kusuki, Kosei Suzuyama, Yin Tang
We conjecture that the universal logarithmic coefficient for capacity of entanglement is bounded below by the corresponding entropy coefficient $c_{\mathrm{eff}}…
The Role of Completeness in Probing Symmetry Breaking
Yuya Kusuki, Hiroyasu Tajima, Shion Yamashika
Completeness is widely recognized in quantum information as an important property of a family of monotones, because it ensures that no information relevant to state conversion is l…
Complex Conformal Manifolds
Yuma Furuta, Wataru Harada, Yuya Kusuki +1
Complex conformal field theories (CFTs) have recently emerged as essential frameworks for understanding non-Hermitian criticality, weakly first-order phase transitions, and walking…
Continuous Family of Conformal Field Theories and Exactly Marginal Operators
Shota Komatsu, Yuya Kusuki, Marco Meineri +1
Does a conformal manifold imply the existence of exactly marginal operators? We answer this question affirmatively under the assumption that there exists a conformal interface with…
Resource-Theoretic Quantifiers of Weak and Strong Symmetry Breaking: Strong Entanglement Asymmetry and Beyond
Yuya Kusuki, Sridip Pal, Hiroyasu Tajima
Quantifying how much a quantum state breaks a symmetry is essential for characterizing phases, nonequilibrium dynamics, and open-system behavior. For mixed states, however, convent…
Transmission Coefficients from Phantom Currents
Yuma Furuta, Yuya Kusuki, Toshiki Onagi
A representative quantity that characterizes the dynamics of conformal interfaces is the transmission coefficient, which is defined through correlation functions of the stress tens…
New Crosscap States
Wataru Harada, Justin Kaidi, Yuya Kusuki +1
We investigate crosscap states in two-dimensional rational conformal field theories (RCFTs), with an emphasis on the role of non-invertible symmetries. In particular, we argue for…
Universality of Rényi Entropy in Conformal Field Theory
Yuya Kusuki, Hirosi Ooguri, Sridip Pal
We use the thermal effective theory to prove that, for the vacuum state in any conformal field theory in dimensions, the -th Rényi entropy behaves as $S_A^{(n)}…
Modern Approach to 2D Conformal Field Theory
Yuya Kusuki
The primary aim of these lecture notes is to introduce the modern approach to two-dimensional conformal field theory (2D CFT). The study of analytical methods in two-dimensional co…
Entanglement asymmetry and symmetry defects in boundary conformal field theory
Yuya Kusuki, Sara Murciano, Hirosi Ooguri +1
A state in a quantum system with a given global symmetry, , can be sensitive to the presence of boundaries, which may either preserve or break this symmetry. In this work, we in…
Universal Bound on Effective Central Charge and Its Saturation
Andreas Karch, Yuya Kusuki, Hirosi Ooguri +2
The effective central charge (denoted by ) is a measure of entanglement through a conformal interface, while the transmission coefficient (encoded in the coefficien…
Symmetry-resolved Entanglement Entropy, Spectra & Boundary Conformal Field Theory
Yuya Kusuki, Sara Murciano, Hirosi Ooguri +1
We perform a comprehensive analysis of the symmetry-resolved (SR) entanglement entropy (EE) for one single interval in the ground state of a D conformal field theory (CFT), th…
Universality of Effective Central Charge in Interface CFTs
Andreas Karch, Yuya Kusuki, Hirosi Ooguri +2
When an interface connects two CFTs, the entanglement entropy between the two CFTs is determined by a quantity called the effective central charge. The effective central charge doe…
On Quantum Information Before the Page Time
Jonah Kudler-Flam, Yuya Kusuki
While recent progress in the black hole information problem has shown that the entropy of Hawking radiation follows a unitary Page curve, the quantum state of Hawking radiation pri…
AdS/BCFT from Conformal Bootstrap: Construction of Gravity with Branes and Particles
Yuya Kusuki, Zixia Wei
We initiate a conformal bootstrap program to study AdS3/BCFT2 with heavy excitations. We start by solving the bootstrap equations associated with two-point functions of scalar/non-…
Reflected Entropy in Boundary/Interface Conformal Field Theory
Yuya Kusuki
Boundary conformal field theory (BCFT) and interface conformal field theory (ICFT) attract attention in the context of the information paradox problem. On this background, we devel…
Semiclassical Gravity from Averaged Boundaries in two-dimensional BCFTs
Yuya Kusuki
The interpretation of semiclassical gravity as an ensemble-average of CFTs has provided much progress in understanding the factorization problem and the information paradox. In thi…
Analytic Bootstrap in 2D Boundary Conformal Field Theory: Towards Braneworld Holography
Yuya Kusuki
Recently, boundary conformal field theories (BCFTs) have attracted much attention in the context of quantum gravity. This is because a BCFT can be dual to gravity coupled to a heat…
Product of Random States and Spatial (Half-)Wormholes
Kanato Goto, Yuya Kusuki, Kotaro Tamaoka +1
We study how coarse-graining procedure of an underlying UV-complete quantum gravity gives rise to a connected geometry. It has been shown, quantum entanglement plays a key role in…
Holographic moving mirrors
Ibrahim Akal, Yuya Kusuki, Noburo Shiba +2
Moving mirrors have been known as tractable setups modeling Hawking radiation from black holes. In this paper, motivated by recent developments regarding the black hole information…
Entanglement entropy in holographic moving mirror and Page curve
Ibrahim Akal, Yuya Kusuki, Noburo Shiba +2
We calculate the time evolution of entanglement entropy in two dimensional conformal field theory with a moving mirror. For a setup modeling Hawking radiation, we obtain a linear g…
Universality in asymptotic bounds and its saturation in D CFT
Diptarka Das, Yuya Kusuki, Sridip Pal
We study asymptotics of three point coefficients (light-light-heavy) and two point correlators in heavy states in unitary, compact D CFTs. We prove an upper and lower bound on s…
The quasi-particle picture and its breakdown after local quenches: mutual information, negativity, and reflected entropy
Jonah Kudler-Flam, Yuya Kusuki, Shinsei Ryu
We study the dynamics of (Rényi) mutual information, logarithmic negativity, and (Rényi) reflected entropy after exciting the ground state by a local operator. Together with recent…
Codimension two holography for wedges
Ibrahim Akal, Yuya Kusuki, Tadashi Takayanagi +1
We propose a codimension two holography between a gravitational theory on a dimensional wedge spacetime and a dimensional CFT which lives on the corner of the wedge. Fo…