Browsing by Author "Biswas, Asoka"

Now showing items 1-5 of 5

    • Implementing Deutsch-Jozsa algorithm using light shifts and atomic ensembles 

      Dasgupta, Shubhrangshu; Biswas, Asoka; Agarwal, G. S. (American Physical Society, 2005-01-27)
      We present an optical scheme to implement the Deutsch-Jozsa algorithm using ac Stark shifts. The scheme uses an atomic ensemble consisting of four-level atoms interacting dispersively with a field. This leads to a Hamiltonian ...

    • Inseparability inequalities for higher order moments for bipartite systems 

      Agarwal, G. S.; Biswas, Asoka (IOP Publishing, 2005-10-07)
      There are several examples of bipartite entangled states of continuous variables for which the existing criteria for entanglement using the inequalities involving the second-order moments are insufficient. We derive new ...

    • Nonclassicality and decoherence of photon-subtracted squeezed states 

      Biswas, Asoka; Agarwal, G. S. (American Physical Society, 2007-03-07)
      We discuss nonclassical properties of single-photon subtracted squeezed vacuum states in terms of the sub-Poissonian statistics and the negativity of the Wigner function. We derive a compact expression for the Wigner ...

    • Quantum logic gates using Stark-shifted Raman transitions in a cavity 

      Biswas, Asoka; Agarwal, G. S. (American Physical Society, 2004-06-04)
      We present a scheme to realize the basic two-qubit logic gates such as quantum phase gate and controlled-NOT gate using a detuned optical cavity interacting with a three-level Raman system. We discuss the role of Stark ...

    • Transfer of an unknown quantum state, quantum networks, and memory 

      Biswas, Asoka; Agarwal, G. S. (American Physical Society, 2004-08-27)
      We present a protocol for transfer of an unknown quantum state. The protocol is based on a two-mode cavity interacting dispersively in a sequential manner with three-level atoms in the Lambda configuration. We propose a ...