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- A. K. Pati, P. K. Sahu
- 2006

We prove a new sum uncertainty relation in quantum theory which states that the uncertainty in the sum of two or more observables is always less than or equal to the sum of the uncertainties in corresponding observables. This shows that the quantum mechanical uncertainty in any observable is a convex function. We prove that if we have a finite number N of… (More)

- Arun K. Pati
- 2003

We quantify various possible entanglement measures for the four-particles GHZ entangled state that has been produced experimentally [C. Sackett et al, Nature 404, 256-259 (2000)]. In quantum world entangled states naturally arise due to tensor product structure of the composite Hilbert space and the linear superposition principle. This was first realized by… (More)

- A. K. Pati
- 1998

We establish a fluctuation-correlation theorem by relating the quantum fluctuations in the generator of the parameter change to the time integral of the quantum correlation function between the projection operator and force operator of the “fast” system. By taking a cue from linear response theory we relate the quantum fluctuation in the generator to the… (More)

- Arun Kumar Pati, Biswajit Pradhan, Pankaj Agrawal
- Quantum Information Processing
- 2012

- Chiranjib Mukhopadhyay, Namrata Shukla, Arun Kumar Pati
- ArXiv
- 2015

We formulate three new error disturbance relations, one of which is free from explicit dependence upon intrinsic fluctuations of observables. The first error-disturbance relation is tighter than the one provided by the Branciard inequality and the Ozawa inequality for some initial states. Other two error disturbance relations provide a tighter bound to… (More)

- Arun Kumar Pati, Pankaj Agrawal
- Quantum Information Processing
- 2012

- Arun K. Pati
- 2008

Quantum operations represented by completely positive maps encompass many of the physical processes and have been very powerful in describing quantum computation and information processing tasks. We introduce the notion of relative phase change for a quantum system undergoing quantum operation. We find that the relative phase shift of a system not only… (More)

We consider W-states and generalized W-states for n-qubit systems. We obtain conditions to use these states as quantum resources to teleport unknown states. Only a limited class of multiqubit states can be teleported. For one-qubit states, we use protocols which are simple extensions of the conventional teleportation protocol. We also show that these… (More)

- Arun K Pati, Mamata Sahoo, Biswajit Pradhan
- Physical review. E, Statistical, nonlinear, and…
- 2010

The universal quantum work relation connects a functional of an arbitrary observable averaged over the forward process to the free-energy difference and another functional averaged over the time-reversed process. Here, we ask the question if the system is driven out of equilibrium by a different Hamiltonian rather than the original one during the forward… (More)

- Shrobona Bagchi, Arun Kumar Pati
- ArXiv
- 2015

For bipartite pure and mixed quantum states, in addition to the quantum mutual information, there is another measure of total correlation, namely, the entanglement of purification. We study the monogamy, polygamy, and additivity properties of the entanglement of purification for pure and mixed states. In this paper, we show that, in contrast to the quantum… (More)

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