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Submitted on: 24 March 2008.
Revised on: 28 May 2008.
Accepted on: 24 July 2008.
___________________EPJ Quantum Technology---SPRINGER
Submitted on: 23 August 2001.
Revised on: 05 October 2001.
Accepted on: 21 November 2001.
___________________EPJ Quantum Technology---SPRINGER
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Submitted on: 22 November 2024.
Revised on: 19 January 2025.
Accepted on: 02 March 2025.
___________________EPJ Quantum Technology---SPRINGER
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Submitted on: 18 November 2022.
Revised on: 14 January 2023.
Accepted on: 02 March 2023.
___________________EPJ Quantum Technology---SPRINGER
Submitted on: 17 November 2018.
Revised on: 31 January 2019.
Accepted on: 27 March 2019.
___________________EPJ Quantum Technology---SPRINGER
Submitted on: 19 May 2005.
Revised on: 09 June 2005.
Accepted on: 17 July 2005.
___________________EPJ Quantum Technology---SPRINGER