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Submitted on: 07 June 2004.
Revised on: 27 August 2004.
Accepted on: 04 October 2004.
___________________EPJ Quantum Technology---SPRINGER
Submitted on: 16 December 2002.
Revised on: 30 March 2003.
Accepted on: 26 April 2003.
___________________EPJ Quantum Technology---SPRINGER
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Submitted on: 04 July 2014.
Revised on: 31 October 2014.
Accepted on: 13 November 2014.
___________________EPJ Quantum Technology---SPRINGER