Entanglement sensitivity to signal attenuation and amplification

FILIPPOV, Sergey N. a Mário ZIMAN. Entanglement sensitivity to signal attenuation and amplification. Physical Review A. 2014, roč. 90, č. 1, s. 1-5. ISSN 1050-2947. Dostupné z: https://dx.doi.org/10.1103/PhysRevA.90.010301.

Základní údaje

• Originální název: Entanglement sensitivity to signal attenuation and amplification
• Autoři: FILIPPOV, Sergey N. (643 Rusko) a Mário ZIMAN (703 Slovensko, garant, domácí).
• Vydání: Physical Review A, 2014, 1050-2947.

Další údaje

• Originální jazyk: angličtina
• Typ výsledku: Článek v odborném periodiku
• Obor: 10301 Atomic, molecular and chemical physics
• Stát vydavatele: Spojené státy
• Utajení: není předmětem státního či obchodního tajemství
• WWW: URL
• Impakt faktor: Impact factor: 2.808
• Kód RIV: RIV/00216224:14330/14:00073889
• Organizační jednotka: Fakulta informatiky
• Doi: http://dx.doi.org/10.1103/PhysRevA.90.010301
• UT WoS: 000338649000001
• Klíčová slova anglicky: quantum information; entanglement; quantum dynamics; quantum optics

Anotace

We analyze general laws of continuous-variable entanglement dynamics during the deterministic attenuation and amplification of the physical signal carrying the entanglement. These processes are inevitably accompanied by noises, so we find fundamental limitations on noise intensities that destroy entanglement of Gaussian and non-Gaussian input states. The phase-insensitive amplification Phi1(x)Phi2(x)...(x)PhiN with the power gain ki>2 (approx 3 dB, i=1,...,N) is shown to destroy entanglement of any N-mode Gaussian state even in the case of quantum-limited performance. In contrast, we demonstrate non-Gaussian states with the energy of a few photons such that their entanglement survives within a wide range of noises beyond quantum-limited performance for any degree of attenuation or gain. We detect entanglement preservation properties of the channel Phi1(x)Phi2, where each mode is deterministically attenuated or amplified. Gaussian states of high energy are shown to be robust to very asymmetric attenuations, whereas non-Gaussian states are at an advantage in the case of symmetric attenuation and general amplification. If Phi1=Phi2, the total noise should not exceed 0.5(1+k2)1/2 to guarantee entanglement preservation.

Návaznosti

• GAP202/12/1142, projekt VaV: Název: Slabé zdroje entanglementu a náhodnosti

Investor: Grantová agentura ČR, Weak sources of entanglement and randomness