Submitted on: 13 April 2012.
Revised on: 01 June 2012.
Accepted on: 03 July 2012.
___________________EPJ Quantum Technology---SPRINGER
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Submitted on: 20 June 2002.
Revised on: 06 August 2002.
Accepted on: 25 August 2002.
___________________EPJ Quantum Technology---SPRINGER
Submitted on: 27 July 2003.
Revised on: 24 November 2003.
Accepted on: 19 December 2003.
___________________EPJ Quantum Technology---SPRINGER
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Submitted on: 24 November 2010.
Revised on: 30 January 2011.
Accepted on: 15 February 2011.
___________________EPJ Quantum Technology---SPRINGER
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Submitted on: 17 August 2001.
Revised on: 31 October 2001.
Accepted on: 11 December 2001.
___________________EPJ Quantum Technology---SPRINGER