Programmable quantum-state discriminator by nuclear magnetic resonance

Gopinath, T and Das, Ranabir and Kumar, Anil (2005) Programmable quantum-state discriminator by nuclear magnetic resonance. In: Physical Review A, 71 (4). 042307-1.

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Abstract

A programmable quantum-state discriminator is implemented by using nuclear magnetic resonance. We use a two-qubit spin-1/2 system, one for the data qubit and one for the ancilla (program) qubit. This device does the unambiguous (error-free) discrimination of a pair of states of the data qubit that are symmetrically located about a fixed state. The device is used to discriminate both linearly polarized states and elliptically polarized states. The maximum probability of successful discrimination is achieved by suitably preparing the ancilla qubit. It is also shown that the probability of discrimination depends on the angle of the unitary operator of the protocol and ellipticity of the data qubit state.

Item Type:	Journal Article
Publication:	Physical Review A
Publisher:	American physical society
Additional Information:	Copyright of this article belongs to American physical society.
Keywords:	Transition-Selective Pulses;Nonorthogonal States;Computer;Computation;Implementation;Nmr;Algorithm;Gate;Differentiate;Spectroscopy
Department/Centre:	Division of Chemical Sciences > Sophisticated Instruments Facility (Continued as NMR Research Centre) Division of Physical & Mathematical Sciences > Physics
Date Deposited:	09 Feb 2010 11:53
Last Modified:	19 Sep 2010 04:56
URI:	http://eprints.iisc.ac.in/id/eprint/17285

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