Volume 87, Number 6, September 2009
Article Number 60008
Number of page(s) 5
Section General
Published online 09 October 2009
EPL, 87 (2009) 60008
DOI: 10.1209/0295-5075/87/60008

Secure quantum conversation through non-destructive discrimination of highly entangled multipartite states

Sakshi Jain1, Sreraman Muralidharan2 and Prasanta K. Panigrahi3, 4

1   Indian Institute of Technology-Bombay - Mumbai, 400076, India
2   Department of Information and communication technology, Royal Institute of Technology (KTH) SE-164 40 Kista, Sweden, EU
3   Indian Institute of Science Education and Research Kolkata, BCKV Campus Main Office - Mohanpur, 741252, India
4   Physical Research Laboratory - Navrangpura, Ahmedabad, 380 009, India

received 13 July 2009; accepted in final form 11 September 2009; published September 2009
published online 9 October 2009

“Quantum conversation” is a way in which two parties can communicate classical information with each other using entanglement as a shared resource. We present this scheme using a multipartite entangled state after describing its generation through appropriate circuit diagrams. We make use of a discrimination scheme which allows one to perform a measurement on the system without destroying its entanglement. We later prove that this scheme is secure in a noiseless and a lossless quantum channel.

03.67.Hk - Quantum communication.
03.65.Ud - Entanglement and quantum nonlocality (e.g. EPR paradox, Bell's inequalities, GHZ states, etc.).

© EPLA 2009