223 citations · 1.6k across the 43 of their papers we have counts for
48 papers
A semiclassical Hilbert space for random matrix theory
Abhirup Bhattacharya, Onkar Parrikar, Vivek Singh
We study the one-sided time evolution of thermofield double (TFD) states in random matrix theory, where the Hamiltonian is taken to be a random matrix drawn from a unit…
Stabilizer complexity and the Python's lunch
Abhirup Bhattacharya, Jatin Narde, Onkar Parrikar +1
In this note, we study the stabilizer complexity of the reduced density matrix corresponding to one side of a partially entangled thermal (PET) state with fixed energy boundary con…
Wigner negativity in Krylov space and emergent semiclassicality
Vijay Balasubramanian, Pawel Caputa, Onkar Parrikar +1
We propose that the Krylov basis gives a semiclassical representation of dynamics in general large-, complex, many-body systems. As a probe of this semiclassicality, we study th…
Fortuity and Complexity in a Simple Quark Model
Jackson R. Fliss, Vishnu Jejjala, Onkar Parrikar
We observe and elaborate on a structural similarity between the categorization of monotone and fortuitous BPS operators in supersymmetric theories and gauge invariant quark operato…
Modular Witten Diagrams and Quantum Extremality
Abhirup Bhattacharya, Onkar Parrikar
We study entanglement entropy for ball-shaped regions in excited states of holographic conformal field theories. The excited states are prepared by the Euclidean path integral in t…
Covariant phase space and the semi-classical Einstein equation
Abhirup Bhattacharya, Onkar Parrikar
The covariant phase space formalism in general relativity is a covariant method for constructing the symplectic two-form, Hamiltonian and other conserved charges on the phase space…
On the stabilizer complexity of Hawking radiation
Ritam Basu, Onkar Parrikar, Suprakash Paul +1
We study the complexity of Hawking radiation for an evaporating black hole from the perspective of the stabilizer theory of quantum computation. Specifically, we calculate Wigner n…
Entanglement spreading and emergent locality in Brownian SYK chains
Jatin Narde, Onkar Parrikar, Harshit Rajgadia +1
The Ryu-Takayanagi (RT) formula and its interpretation in terms of quantum error correction (QEC) implies an emergent locality for the spread of quantum information in holographic…
Wigner negativity, random matrices and gravity
Ritam Basu, Pratyusha Chowdhury, Anirban Ganguly +3
Given a choice of an ordered, orthonormal basis for a -dimensional Hilbert space, one can define a discrete version of the Wigner function -- a quasi-probability distribution wh…
York time in JT gravity
Onkar Parrikar, Sunil Kumar Sake
The notion of time in general relativity must arise from an internal clock, i.e., a degree of freedom in the gravitational theory internal to the system that can serve the role of…
Relational bulk reconstruction from modular flow
Onkar Parrikar, Harshit Rajgadia, Vivek Singh +1
The entanglement wedge reconstruction paradigm in AdS/CFT states that for a bulk qudit within the entanglement wedge of a boundary subregion , operators acting on the bulk…
Complexity Growth and the Krylov-Wigner function
Ritam Basu, Anirban Ganguly, Souparna Nath +1
For any state in a -dimensional Hilbert space with a choice of basis, one can define a discrete version of the Wigner function -- a quasi-probability distribution which represen…
The S-matrix and boundary correlators in flat space
Diksha Jain, Suman Kundu, Shiraz Minwalla +3
We consider the path integral of a quantum field theory in Minkowski spacetime with fixed boundary values (for the elementary fields) on asymptotic boundaries. We define and study…
Canonical Purification and the Quantum Extremal Shock
Onkar Parrikar, Vivek Singh
We study the canonical purification (with respect to one of the parties) of pure, bi-partite states obtained by turning on sources in the Euclidean path integral. In holographic co…
Quantum Error Correction from Complexity in Brownian SYK
Vijay Balasubramanian, Arjun Kar, Cathy Li +2
We study the robustness of quantum error correction in a one-parameter ensemble of codes generated by the Brownian SYK model, where the parameter quantifies the encoding complexity…
Quantum Error Correction in the Black Hole Interior
Vijay Balasubramanian, Arjun Kar, Cathy Li +1
We study the quantum error correction properties of the black hole interior in a toy model for an evaporating black hole: Jackiw-Teitelboim gravity entangled with a non-gravitation…
The Markov gap for geometric reflected entropy
Patrick Hayden, Onkar Parrikar, Jonathan Sorce
The reflected entropy of a density matrix is a bipartite correlation measure lower-bounded by the quantum mutual information . In holographic states sat…
Islands with Gravitating Baths: Towards ER = EPR
Louise Anderson, Onkar Parrikar, Ronak M Soni
We study the Page curve and the island rule for black holes evaporating into gravitating baths, with an eye towards establishing a connection with the ER=EPR proposal. We consider…
Complexity Growth in Integrable and Chaotic Models
Vijay Balasubramanian, Matthew DeCross, Arjun Kar +2
We use the SYK family of models with Majorana fermions to study the complexity of time evolution, formulated as the shortest geodesic length on the unitary group manifold betwe…
Building Tensor Networks for Holographic States
Pawel Caputa, Jorrit Kruthoff, Onkar Parrikar
We discuss a one-parameter family of states in two-dimensional holographic conformal field theories which are constructed via the Euclidean path integral of an effective theory on…
On the flow of states under
Jorrit Kruthoff, Onkar Parrikar
We study the deformation of two dimensional quantum field theories from a Hamiltonian point of view, focusing on aspects of the theory in Lorentzian signature. Our…
Geometric secret sharing in a model of Hawking radiation
Vijay Balasubramanian, Arjun Kar, Onkar Parrikar +2
We consider a black hole in three dimensional AdS space entangled with an auxiliary radiation system. We model the microstates of the black hole in terms of a field theory living o…
Modular Hamiltonians for Euclidean Path Integral States
Srivatsan Balakrishnan, Onkar Parrikar
We study half-space/Rindler modular Hamiltonians for excited states created by turning on sources for local operators in the Euclidean path integral in relativistic quantum field t…
Search Optimization, Funnel Topography, and Dynamical Criticality on the String Landscape
Justin Khoury, Onkar Parrikar
A striking feature of our universe is its near criticality. The cosmological constant and weak hierarchy problems, as well as the metastability of the electroweak vacuum, can all b…