Submitted on: 13 February 2003.
Revised on: 20 May 2003.
Accepted on: 14 June 2003.
___________________EPJ Quantum Technology---SPRINGER
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Submitted on: 15 April 2022.
Revised on: 04 June 2022.
Accepted on: 08 July 2022.
___________________EPJ Quantum Technology---SPRINGER
Submitted on: 28 March 2015.
Revised on: 27 April 2015.
Accepted on: 26 May 2015.
___________________EPJ Quantum Technology---SPRINGER
Submitted on: 11 January 2020.
Revised on: 24 March 2020.
Accepted on: 03 May 2020.
___________________EPJ Quantum Technology---SPRINGER
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