23 Result(s)

Article

Recurrent Hydatid Disease of Temporal Bone and Skull Base: A Case Report and Literature Review

Hydatid disease is a parasitic infestation caused by Echinococcus granulosus. The disease is rare in the head and neck region with varying presentations. We present a rare case of recurrent hydatid disease of the...

Avvaru Satya Kiran, Asheesh Dora Ghanpur… in Indian Journal of Otolaryngology and Head … (2024)

Article

Quantum and Semi–Quantum key Distribution in Networks

In this paper, we utilize the potential offered by multidimensional separable states (MSS) for secure and simultaneous distributions of keys in a layered network. We present protocols for both quantum and semi-qu...

Rajni Bala, Sooryansh Asthana… in International Journal of Theoretical Physi… (2023)

Article

Combating Errors in Propagation of Orbital Angular Momentum Modes of Light in Turbulent Media

There is a wealth of simulation, experimental and analytical studies on propagation of orbital angular momentum (OAM) modes through atmospheric and oceanic turbulence. Using the data of these studies and gener...

Rajni Bala, Sooryansh Asthana… in International Journal of Theoretical Physi… (2022)

Article

Quantum communication with SU(2) invariant separable \(2\times N\) level systems

Information is encoded in a qubit in the form of its Bloch vector. In this paper, we propose protocols for remote transfers of information in a known and an unknown qubit to qudits using SU(2)-invariant ...

Sooryansh Asthana, Rajni Bala, V. Ravishankar in Quantum Information Processing (2021)

Article

Contextuality-based quantum conferencing

Nonlocality inequalities for multi-party systems act as contextuality inequalities for single qudit systems of suitable dimensions (Heywood and Redhead in Found Phys 13(5):481–499, 1983; Abramsky and Brandenbu...

Rajni Bala, Sooryansh Asthana, V. Ravishankar in Quantum Information Processing (2021)

Article

Weak measurements, non-classicality and negative probability

This paper establishes a direct, robust, and intimate connection among (i) non-classicality tests for various quantum features, e.g. non-Boolean logic, quantum coherence, nonlocality, quantum entanglement, qua...

Sooryansh Asthana, V. Ravishankar in Quantum Information Processing (2021)

Article

Non-locality and entanglement in multi-qubit systems from a unified framework

Non-classical probability is the underlying feature of quantum mechanics. The emergence of Bell-CHSH non-locality [We stress that CHSH inequality (Clauser et al. in Phys. Rev. Lett. 23(15):880, 1969) is more g...

Sooryansh Asthana, Soumik Adhikary, V. Ravishankar in Quantum Information Processing (2021)

Article

Bell-CHSH non-locality and entanglement from a unified framework

Non-classical probability is a defining feature of quantum mechanics. This paper develops a formalism that exhibits explicitly, the manner in which rules of classical probability break down in the quantum doma...

Soumik Adhikary, Sooryansh Asthana, V. Ravishankar in The European Physical Journal D (2020)

Article

Weak classicality in coupled N-level quantum systems

The notion of “weak classical limit” for coupled N-level quantum systems as N → ∞ is introduced to understand the precise sense in which one attains classicality. There exists proofs that a system becomes classic...

Radha Pyari Sandhir, V. Ravishankar in The European Physical Journal D (2019)

Article

CGLMP and Bell–CHSH formulations of non-locality: a comparative study

The CGLMP prescription of non-locality is known to identify certain states that satisfy the Bell–CHSH inequality to be non-local. The demonstration is, however, restricted to a specific family of states. In th...

Radha Pyari Sandhir, Soumik Adhikary, V. Ravishankar in Quantum Information Processing (2017)

Article

Optimal observables to determine entanglement of a two qubit state

Experimental determination of entanglement is important not only to characterize the state and use it in quantum information, but also in understanding complicated phenomena such as phase transitions. In this ...

G. Chaudhary, V. Ravishankar in The European Physical Journal D (2016)

Article

Hot QCD equations of state and RHIC

We show how hot QCD equations of states can be adapted to make definite predictions for quarkgluon plasma at RHIC.We consider equations of state up to O(g⁵) and O[g⁶(ln(1/g)+δ)]. Our method involves the extractio...

Vinod Chandra, Ravindra Kumar, V. Ravishankar in Indian Journal of Physics (2010)

Article

Introduction to Quark-Gluon plasma

Study of Quark-Gluon plasma (QGP) has been a very active area of research in high energy physics since last four decades. This article gives an elementary introduction to QGP. It covers the motivation to study...

Akhilesh Ranjan, V. Ravishankar in Indian Journal of Physics (2010)

Article

Entanglement dynamics in two-qubit open system interacting with a squeezed thermal bath via quantum nondemolition interaction

We analyze the dynamics of entanglement in a two-qubit system interacting with an initially squeezed thermal environment via a quantum nondemolition system-reservoir interaction, with the system and reservoir...

S. Banerjee, V. Ravishankar, R. Srikanth in The European Physical Journal D (2010)

Article

Quasi-particle model for lattice QCD: quark–gluon plasma in heavy ion collisions

We propose a quasi-particle model to describe the lattice QCD equation of state for pure SU(3) gauge theory in its deconfined state, for T≥1.5T _c. The method involves map** the interacti...

Vinod Chandra, V. Ravishankar in The European Physical Journal C (2009)

Article

On the chromo-electric permittivity and Debye screening in hot QCD

We study the response functions (chromo-electric susceptibilities) for an interacting quark-gluon plasma. The interaction effects have been encoded in the effective fugacities for quasi-partons which are extra...

V. Chandra, A. Ranjan, V. Ravishankar in The European Physical Journal A (2009)

Article

Viscosity and thermodynamic properties of QGP in relativistic heavy-ion collisions

We study the viscosity and thermodynamic properties of QGP at RHIC by employing the recently extracted equilibrium distribution functions from two hot QCD equations of state of O(g ⁵) and

Vinod Chandra, V. Ravishankar in The European Physical Journal C (2009)

Article

Surgical management of native valve endocarditis

D Ganguly, V Ravishankar, G Ganguly, A Garg… in Indian Journal of Thoracic and Cardiovascu… (2004)

Article

Preface

P Jain, S D Joglekar, V Ravishankar in Pramana (2003)