429 citations · 1.8k across the 36 of their papers we have counts for
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Local approximations of global Hamiltonian from inclusion of algebras
Yidong Chen, Nima Lashkari, Kwing Lam Leung
We write down the global Hamiltonian of conformal field theory (CFT) in finite volume in terms of the modular Hamiltonian of the vacuum reduced to a local ball-shaped region, and u…
Operator Algebras and Third Quantization
Yidong Chen, Marius Junge, Nima Lashkari
In quantum gravity, the gravitational path integral involves a sum over topologies, representing the joining and splitting of multiple universes. To account for topology change, on…
Modular Intersections, Time Interval Algebras and Emergent AdS
Nima Lashkari, Kwing Lam Leung, Mudassir Moosa +1
We compute the modular flow and conjugation of time interval algebras of conformal Generalized Free Fields (GFF) in -dimensions in vacuum. For non-integer scaling dimensions…
A Lindbladian for exact renormalization of density operators in QFT
Samuel Goldman, Nima Lashkari, Robert G. Leigh
In arXiv:1609.03493, the authors extended the exact renormalization group (ERG) to arbitrary wave-functionals in quantum field theory (QFT). Applying this formalism, we show that t…
Local Poincaré Algebra from Quantum Chaos
Shoy Ouseph, Keiichiro Furuya, Nima Lashkari +2
The local two-dimensional Poincaré algebra near the horizon of an eternal AdS black hole, or in proximity to any bifurcate Killing horizon, is generated by the Killing flow and out…
Information loss, mixing and emergent type III factors
Keiichiro Furuya, Nima Lashkari, Mudassir Moosa +1
A manifestation of the black hole information loss problem is that the two-point function of probe operators in a large Anti-de Sitter black hole decays in time, whereas, on the bo…
Exact Renormalization of Wave Functionals yields Continuous MERA
Samuel Goldman, Nima Lashkari, Robert G. Leigh +1
The exact renormalization group (ERG) is a powerful tool for understanding the formal properties of field theories. By adapting generalized ERG schemes to the flow of wavefunctiona…
Renormalization group and approximate error correction
Keiichiro Furuya, Nima Lashkari, Mudassir Moosa
In renormalization group (RG) flow, the low energy states form a code subspace that is approximately protected against the local short-distance errors. We motivate this connection…
Real-space RG, error correction and Petz map
Keiichiro Furuya, Nima Lashkari, Shoy Ouseph
There are two parts to this work: First, we study the error correction properties of the real-space renormalization group (RG). The long-distance operators are the (approximately)…
Generalized Entanglement, Charges and Intertwiners
Keiichiro Furuya, Nima Lashkari, Shoy Ouseph
The entanglement theory in quantum systems with internal symmetries is rich due to the spontaneous creation of entangled pairs of charge/anti-charge particles at the entangling sur…
Modular zero modes and sewing the states of QFT
Nima Lashkari
We point out an important difference between continuum relativistic quantum field theory (QFT) and lattice models with dramatic consequences for the theory of multi-partite entangl…
Perturbation Theory for the Logarithm of a Positive Operator
Nima Lashkari, Hong Liu, Srivatsan Rajagopal
In various contexts in mathematical physics one needs to compute the logarithm of a positive unbounded operator. Examples include the von Neumann entropy of a density matrix and th…
Modular Flow of Excited States
Nima Lashkari, Hong Liu, Srivatsan Rajagopal
We develop new techniques for studying the modular and the relative modular flows of general excited states. We show that the class of states obtained by acting on the vacuum (or a…
Constraining Quantum Fields using Modular Theory
Nima Lashkari
Tomita-Takesaki modular theory provides a set of algebraic tools in quantum field theory that is suitable for the study of the information-theoretic properties of states. For every…
Universality of Quantum Information in Chaotic CFTs
Nima Lashkari, Anatoly Dymarsky, Hong Liu
We study the Eigenstate Thermalization Hypothesis (ETH) in chaotic conformal field theories (CFTs) of arbitrary dimensions. Assuming local ETH, we compute the reduced density matri…
Entanglement at a Scale and Renormalization Monotones
Nima Lashkari
We study the information content of the reduced density matrix of a region in quantum field theory that cannot be recovered from its subregion density matrices. We reconstruct the…
Eigenstate Thermalization Hypothesis in Conformal Field Theory
Nima Lashkari, Anatoly Dymarsky, Hong Liu
We investigate the eigenstate thermalization hypothesis (ETH) in d+1 dimensional conformal field theories by studying reduced density matrices in energy eigenstates. We show that i…
Gravitational Positive Energy Theorems from Information Inequalities
Nima Lashkari, Jennifer Lin, Hirosi Ooguri +2
In this paper we argue that classical, asymptotically AdS spacetimes that arise as states in consistent ultraviolet completions of Einstein gravity coupled to matter must satisfy a…
Modular Hamiltonian of Excited States in Conformal Field Theory
Nima Lashkari
We present a novel replica trick that computes the relative entropy of two arbitrary states in conformal field theory. Our replica trick is based on the analytic continuation of pa…
Canonical Energy is Quantum Fisher Information
Nima Lashkari, Mark Van Raamsdonk
In quantum information theory, Fisher Information is a natural metric on the space of perturbations to a density matrix, defined by calculating the relative entropy with the unpert…
Inviolable energy conditions from entanglement inequalities
Nima Lashkari, Charles Rabideau, Philippe Sabella-Garnier +1
Via the AdS/CFT correspondence, fundamental constraints on the entanglement structure of quantum systems translate to constraints on spacetime geometries that must be satisfied in…
The Information Theoretic Interpretation of the Length of a Curve
Bartlomiej Czech, Patrick Hayden, Nima Lashkari +1
In the context of holographic duality with AdS3 asymptotics, the Ryu-Takayanagi formula states that the entanglement entropy of a subregion is given by the length of a certain bulk…
Relative Entropies in Conformal Field Theory
Nima Lashkari
Relative entropy is a measure of distinguishability for quantum states, and plays a central role in quantum information theory. The family of Renyi entropies generalizes to Renyi r…
From state distinguishability to effective bulk locality
Nima Lashkari, Joan Simon
We provide quantitative evidence that the emergence of an effective notion of spacetime locality in black hole physics is due to restricting to the subset of observables that are u…