63 citations · 109 across the 13 of their papers we have counts for
16 papers
Entanglement of purification for Werner states: canonical purification and nonadditivity
Zahra Baghali Khanian, Amir-Reza Negari
We prove that the von Neumann entanglement of purification is nonadditive. For two-qubit Werner states with singlet weight , we show that canonical purifica…
From Permutation Symmetry to Communication Bounds and Additivity
Zahra Baghali Khanian, Debbie Leung, Graeme Smith
Correlations across channel uses can improve quantum communication rates, making optimization over arbitrarily large blocks a central difficulty in determining quantum capacity. We…
Rényi Entanglement of Purification Is Non-additive
Amir-Reza Negari, Zahra Baghali Khanian
Entanglement of purification is a fundamental measure of total correlations whose additivity remains unresolved. We study its additivity for classical states on two qubits at diffe…
Additivity Results for the Rényi-2 Entanglement of Purification
Shokoufe Faraji, Zahra Baghali Khanian
We reformulate the Rényi entanglement of purification as a constrained minimum output Rényi entropy problem. Equivalently, for , this formulation can be expressed in terms of…
Entanglement sharing schemes
Zahra Khanian, Dongjin Lee, Debbie Leung +7
We ask how quantum correlations can be distributed among many subsystems. To address this, we define entanglement sharing schemes (ESS) where certain pairs of subsystems allow enta…
On Strong Converse Bounds for the Private and Quantum Capacities of Anti-degradable Channels
Zahra Baghali Khanian, Christoph Hirche
We establish a strong converse bound for the private classical capacity of anti-degradable quantum channels. Specifically, we prove that this capacity is zero whenever the error $ε…
Quantum Reverse Shannon Theorem Revisited
Zahra Baghali Khanian, Debbie Leung
Reverse Shannon theorems concern the use of noiseless channels to simulate noisy ones. This is dual to the usual noisy channel coding problem, where a noisy (classical or quantum)…
The Generalized Capacity of a Quantum Channel
Zahra Baghali Khanian
The transmission of classical information over a classical channel gave rise to the classical capacity theorem with the optimal rate in terms of the classical mutual information. D…
Rate-Distortion Theory for Mixed States
Zahra Baghali Khanian, Kohdai Kuroiwa, Debbie Leung
This paper is concerned with quantum data compression of asymptotically many independent and identically distributed copies of ensembles of mixed quantum states. The encoder has ac…
Strong Converse Bounds for Compression of Mixed States
Zahra Baghali Khanian
In this paper, we study strong converse properties for both visible and blind compression of mixed states. The optimal rate of a visible compression scheme is obtained in terms of…
A Rate-Distortion Perspective on Quantum State Redistribution
Zahra Baghali Khanian, Andreas Winter
We consider a rate-distortion version of the quantum state redistribution task, where the error of the decoded state is judged via an additive distortion measure; it thus constitut…
From Quantum Source Compression to Quantum Thermodynamics
Zahra Baghali Khanian
This thesis addresses problems in the field of quantum information theory. The first part of the thesis is opened with concrete definitions of general quantum source models and the…
Resource theory of heat and work with non-commuting charges
Zahra Baghali Khanian, Manabendra Nath Bera, Arnau Riera +2
We consider a theory of quantum thermodynamics with multiple conserved quantities (or charges). To this end, we generalize the seminal results of Sparaciari et al. [PRA 96:052112,…
General Mixed State Quantum Data Compression with and without Entanglement Assistance
Zahra Baghali Khanian, Andreas Winter
We consider the most general (finite-dimensional) quantum mechanical information source, which is given by a quantum system that is correlated with a reference system . The…
Entanglement-Assisted Quantum Data Compression
Zahra Baghali Khanian, Andreas Winter
Ask how the quantum compression of ensembles of pure states is affected by the availability of entanglement, and in settings where the encoder has access to side information. We fi…
Thermodynamics as a Consequence of Information Conservation
Manabendra Nath Bera, Arnau Riera, Maciej Lewenstein +2
Thermodynamics and information have intricate interrelations. Often thermodynamics is considered to be the logical premise to justify that information is physical - through Landaue…