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Submitted on: 23 March 2012.
Revised on: 15 April 2012.
Accepted on: 10 June 2012.
___________________EPJ Quantum Technology---SPRINGER
Submitted on: 15 September 2014.
Revised on: 05 January 2015.
Accepted on: 16 February 2015.
___________________EPJ Quantum Technology---SPRINGER
Submitted on: 29 January 2015.
Revised on: 10 March 2015.
Accepted on: 24 April 2015.
___________________EPJ Quantum Technology---SPRINGER
Submitted on: 04 April 2004.
Revised on: 07 May 2004.
Accepted on: 19 June 2004.
___________________EPJ Quantum Technology---SPRINGER
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