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Submitted on: 04 May 2006.
Revised on: 19 July 2006.
Accepted on: 09 August 2006.
___________________EPJ Quantum Technology---SPRINGER
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Submitted on: 01 September 2012.
Revised on: 09 December 2012.
Accepted on: 11 January 2013.
___________________EPJ Quantum Technology---SPRINGER
Submitted on: 02 June 2019.
Revised on: 26 September 2019.
Accepted on: 19 October 2019.
___________________EPJ Quantum Technology---SPRINGER
Submitted on: 24 February 1998.
Revised on: 05 April 1998.
Accepted on: 04 May 1998.
___________________EPJ Quantum Technology---SPRINGER
Submitted on: 14 June 1999.
Revised on: 23 August 1999.
Accepted on: 14 October 1999.
___________________EPJ Quantum Technology---SPRINGER