State-dependent linear-optical qubit amplifier

0424184 - FZÚ 2014 RIV US eng J - Článek v odborném periodiku
Bartkiewicz, K. - Černoch, Antonín - Lemr, K.
State-dependent linear-optical qubit amplifier.
Physical Review. A. Roč. 88, č. 6 (2013), "062304-1"-"062304-7". ISSN 1050-2947
Grant CEP: GA ČR GAP205/12/0382
Institucionální podpora: RVO:68378271
Klíčová slova: linear-optical qubit amplifier * quantum cloning * quantum cryptography
Kód oboru RIV: BH - Optika, masery a lasery
Impakt faktor: 2.991, rok: 2013

We propose a linear-optical setup for heralded qubit amplification with tunable output qubit fidelity. We study its success probability as a function of output qubit fidelity, showing that at the expense of lower fidelity, the setup can considerably increase probability of successful operation. These results are subsequently applied in a proposal for state-dependent qubit amplification. Similar to state-dependent quantum cloning, the a priori information about the input state allows us to optimize the qubit amplification procedure to obtain a better fidelity versus success probability trade-off.
Trvalý link: http://hdl.handle.net/11104/0230200