42 citations · 259 across the 16 of their papers we have counts for
16 papers
Highly photon loss tolerant quantum computing using hybrid qubits
S. Omkar, Y. S. Teo, Seung-Woo Lee +1
We investigate a scheme for topological quantum computing using optical hybrid qubits and make an extensive comparison with previous all-optical schemes. We show that the photon lo…
Quantum error correction assisted quantum metrology without entanglement
K. C. Tan, S. Omkar, H. Jeong
In this article we study the role that quantum resources play in quantum error correction assisted quantum metrology (QECQM) schemes. We show that there exist classes of such probl…
Quantum Critical Environment Assisted Quantum Magnetometer
Noufal Jaseem, S. Omkar, Anil Shaji
A central qubit coupled to an Ising ring of qubits, operating close to a critical point is investigated as a potential precision quantum magnetometer for estimating an applied…
Coherence as a Unit Resource for Quantum Error Correction
Kok Chuan Tan, S. Omkar, Hyeonseok Jeong
In this paper we study an error correcting protocol that specifically derives its error correcting properties from elementary units of coherence. The entire protocol from beginning…
Characterization of Unruh Channel in the context of Open Quantum Systems
Subhashish Banerjee, Ashutosh Kumar Alok, S. Omkar +1
We show through the Choi matrix approach that the effect of Unruh acceleration on a qubit is similar to the interaction of the qubit with a vacuum bath, despite the finiteness of t…
The two-qubit amplitude damping channel: characterization using quantum stabilizer codes
S. Omkar, R. Srikanth, Subhashish Banerjee +1
A protocol based on quantum error correction based characterization of quantum dynamics (QECCD) is developed for quantum process tomography on a two-qubit system interacting dissip…
Quantum Fisher and Skew information for Unruh accelerated Dirac qubit
Subhashish Banerjee, Ashutosh Kumar Alok, S. Omkar
We develop a Bloch vector representation of Unruh channel for a Dirac field mode. This is used to provide a unified, analytical treatment of quantum Fisher and Skew information for…
Quasiprobability distributions in open quantum systems: spin-qubit systems
Kishore Thapliyal, Subhashish Banerjee, Anirban Pathak +2
Quasiprobability distributions (QDs) in open quantum systems are investigated for , spin like systems, having relevance to quantum optics and information. In this work, effe…
Quantum code for quantum error characterization
S. Omkar, R. Srikanth, Subhashish Banerjee
A quantum error correcting code is a subspace such that allowed errors acting on any state in can be corrected. A quantum code for which state recovery…
The Unruh effect interpreted as a quantum noise channel
S. Omkar, Subhashish Banerjee, R. Srikanth +1
We make use of the tools of quantum information theory to shed light on the Unruh effect. A modal qubit appears as if subjected to quantum noise that degrades quantum information,…
Characterization of quantum dynamics using quantum error correction
S. Omkar, R. Srikanth, S. Banerjee
Characterizing noisy quantum processes is important to quantum computation and communication (QCC), since quantum systems are generally open. To date, all methods of characterizati…
The operator sum-difference representation for quantum maps: application to the two-qubit amplitude damping channel
S. Omkar, R. Srikanth, Subhashish Banerjee
On account of the Abel-Galois no-go theorem for the algebraic solution to quintic and higher order polynomials, the eigenvalue problem and the associated characteristic equation fo…
Dissipative and Non-dissipative Single-Qubit Channels: Dynamics and Geometry
S. Omkar, R. Srikanth, Subhashish Banerjee
Single-qubit channels are studied under two broad classes: amplitude damping channels and generalized depolarizing channels. A canonical derivation of the Kraus representation of t…
Libertarian free will and quantum indeterminism
Chetan S. Mandayam Nayakar, S. Omkar, R. Srikanth
The basic question in the long-standing debate about free will (FW) is not whether FW can be demonstrated to exist nor even whether it exists, but instead how to define it scientif…
The quantum cryptographic switch
Srinatha Narayanaswamy, Omkar Srikrishna, R. Srikanth +2
We illustrate using a quantum system the principle of a cryptographic switch, in which a third party (Charlie) can control to a continuously varying degree the amount of informatio…
A Robust Quantum Random Number Generator Based on Bosonic Stimulation
H. Akshata Shenoy, S. Omkar, R. Srikanth +1
We propose a method to realize a robust quantum random number generator based on bosonic stimulation. A particular implementation that employs weak coherent pulses and conventional…