Optimal Fidelity of Deletion
Indranil Chakrabarty, Binayak Samadder Choudhury · CERN Document Server (European Organization for Nuclear Research) · 2006
In the recent years many quantum deleting machines are proposed, with varying fidelity of deletion . In this letter we prove that, the fidelity of deletion obtained in [6], is optimal. Here we have considered a more general transformation and obtained the fidelity of deletion as a function of dot product between two vectors on the Bloch sphere . We show that the maximal value this function can attain is 3/4 which is equal to the fidelity of deletion proposed in [6].