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quant-ph2003
Probabilistic cloning and signalling
Sibasish Ghosh, Guruprasad Kar, Samir Kunkri +1
We give a proof of impossibility of probabilistic exact cloning of any three different states of a qubit. The simplicity of the proof is due to the use of a surprising res…
quant-ph2002
Optimal asymmetric cloning machine on a great circle using no-signalling condition
Samir Kunkri, Md. Manirul Ali, Geetu Narang +1
Assuming the condition of no superluminal signalling, we got an upper bound on the quality of all asymmetric cloning machines, acting on qubits whose Bloch vectors lie on…