11 citations · 34 across the 20 of their papers we have counts for
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Useful variants and perturbations of completely entangled subspaces and spans of unextendible product bases
Ritabrata Sengupta, Ajit Iqbal Singh
Finite dimensional entanglement for pure states has been used extensively in quantum information theory. Depending on the tensor product structure, even set of separable states can…
Polynomial representation for multipartite entanglement of resonating valence bond ladders
Ajit Iqbal Singh, Aditi Sen De, Ujjwal Sen
A resonating valence bond (RVB) state of a lattice of quantum systems is a potential resource for quantum computing and communicating devices. It is a superposition of singlet, i.e…
Optimal quantum tomography with constrained elementary measurements arising from unitary bases
S. Chaturvedi, Sibasish Ghosh, K. R. Parthasarathy +1
The purpose of this paper is to introduce techniques of obtaining optimal ways to determine a d-level quantum state or distinguish such states. It entails designing constrained ele…
Entanglement properties of positive operators with ranges in completely entangled subspaces
R Sengupta, Arvind, Ajit Iqbal Singh
We prove that the projection on a completely entangled subspace S of maximum dimension in a multipartite quantum system obtained by Parthasarathy is not positive under partial tran…
Invariants for maximally entangled vectors and unitary bases
Sibasish Ghosh, Ajit Iqbal Singh
The purpose of this paper is to study the equivalence relation on unitary bases defined by R. F. Werner [{\it J. Phys. A: Math. Gen.} {\bf 34} (2001) 7081], relate it to local oper…