8 citations · 27 across the 21 of their papers we have counts for
21 papers
Quantum Illumination with Symmetry-Constrained Random Unitaries
Sooryansh Asthana, Sai Vinjanampathy
Quantum illumination provides a quantum advantage in detecting weakly reflecting objects embedded in a noisy environment, even when environmental noise destroys most of the initial…
Efficient Many-Body Shadow Metrology via Clifford Lensing
Sooryansh Asthana, Conan Alexander, Anubhav Kumar Srivastava +2
Quantum probes that enable enhanced exploration and characterization of complex systems are central to modern science, spanning applications from biology to astrophysics and chemic…
Projected Optimal Sensors from Operator Orbits
Sooryansh Asthana, Yeshma Ibrahim, Norman Tze Wei Koo +1
We unify Ramsey, twist-untwist, and random quantum sensors using operator algebra and account for the Fisher scaling of various sensor designs. We illustrate how the operator orbit…
Indispensability of orbital angular momentum states in secure quantum communication tasks
Rajni Bala, Sooryansh Asthana
Quantum key distribution protocols have been designed for layered networks employing multidimensional entangled and separable orbital angular momentum states [Phys. Rev. A 97, 0323…
Quantum secure direct communication with SU(2) invariant separable polarisation- OAM states
Sooryansh Asthana, Rajni Bala, V. Ravishankar
We propose a quantum secure direct communication protocol using SU (2)- invariant separable states, identified as separable equivalents of two-qubit entangled Werner st…
Relation between nonclassical features through logical qudits
Sooryansh Asthana, V. Ravishankar
Scalable modern-time fault-tolerant quantum computation and quantum communication in a network employ a large number of physical qubits. For example, IBM is reported to have made a…
Collaborative error-immune information transfer with OAM modes of light in networks through atmospheric turbulence
Rajni Bala, Sooryansh Asthana, V. Ravishankar
We present a protocol for collaborative error-immune information through atmospheric turbulence. The protocol allows transferring of information in a network of three participants.
Task-dependent semi-quantum secure communication in layered networks with OAM states of light
Rajni Bala, Sooryansh Asthana, V. Ravishankar
Secure communication in layered networks having differently preferred participants has attracted a lot of research attention. Protocols for key distribution in a layered network ha…
Boosted quantum and semi-quantum communication protocols
Rajni Bala, Sooryansh Asthana, V. Ravishankar
Secure quantum communication protocols based on a prepare-and-measure scheme employ mutually unbiased bases. In these protocols, many runs, in which different participants measure…
Quantum and semi--quantum key distribution in networks
Rajni Bala, Sooryansh Asthana, V. Ravishankar
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 protoc…
Combating quantum errors: an integrated approach
Rajni Bala, Sooryansh Asthana, V. Ravishankar
Near-term quantum communication protocols suffer inevitably from channel noises, whose alleviation has been mostly attempted with resources such as multiparty entanglement or sophi…
Combating errors in propagation of orbital angular momentum modes of light in turbulent media
Rajni Bala, Sooryansh Asthana, V. Ravishankar
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 d…
Nonclassical features in higher-dimensional systems through logical qudits
Sooryansh Asthana, V. Ravishankar
In a recent work [S. Asthana. New Journal of Physics 24.5 (2022): 053026], we have shown the interrelation of different nonclassical correlations in multiqubit systems with quantum…
Integrated semi-quantum layered communication
Rajni Bala, Sooryansh Asthana, V. Ravishankar
In recent times, secure quantum communication in layered networks has emerged as an important area of study. In this paper, we harness the potential offered by multidimensional sta…
Interrelation of nonclassicality conditions through stabiliser group homomorphism
Sooryansh Asthana
In this paper, we show that coherence witness for a single qubit itself yields conditions for nonlocality and entanglement inequalities for multiqubit systems. It also yields a con…
State transfer with separable optical beams and variational quantum algorithms with classical light
Sooryansh Asthana, V. Ravishankar
Classical electromagnetic fields and quantum mechanics -- both obey the principle of superposition alike. This opens up many avenues for simulation of a large variety of phenomena…
Quantum communication with invariant separable level systems
Sooryansh Asthana, Rajni Bala, V. Ravishankar
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…
Contextuality based quantum conferencing
Rajni Bala, Sooryansh Asthana, V. Ravishankar
Nonlocality inequalities for multi-party systems act as contextuality inequalities for single qudit systems of suitable dimensions. In this paper, we propose the procedure for adap…
Non-locality and entanglement in multi-qubit systems from a unified framework
Sooryansh Asthana, Soumik Adhikary, V. Ravishankar
Non-classical probability is the underlying feature of quantum mechanics. The emergence of Bell-CHSH non-locality for bipartite systems and linear entanglement inequalities for two…
Weak measurements, non-classicality and negative probability
Sooryansh Asthana, V. Ravishankar
This paper establishes a direct, robust and intimate connection between (i) non classicality tests for various quantum features, e.g., non-Boolean logic, quantum coherence, nonloca…
A generalised framework for non-classicality of states II: Emergence of non locality and entanglement
Soumik Adhikary, Sooryansh Asthana, V. Ravishankar
A unified formalism was developed in [S. Adhikary et. al., arXiv:1710.04371 [quant-ph]], for describing non-classicality of states by introducing pseudo projection operators in whi…