Quantum linear amplifier enhanced by photon subtraction and addition Academic Article

abstract

• A deterministic quantum amplifier inevitably adds noise to an amplified signal due to the uncertainty principle in quantum physics. We here investigate how a quantum-noise-limited amplifier can be improved by additionally employing the photon subtraction, the photon addition, and a coherent superposition of the two, thereby making a probabilistic, heralded, quantum amplifier. We show that these operations can enhance the performance in amplifying a coherent state in terms of intensity gain, fidelity, and phase uncertainty. In particular, the photon subtraction turns out to be optimal for the fidelity and the phase concentration among these elementary operations, while the photon addition also provides a significant reduction in the phase uncertainty with the largest gain effect. 2012 American Physical Society.

authors

• Nha, Hyunchul

published proceedings

• PHYSICAL REVIEW A

author list (cited authors)

• Kim, H., Lee, S., Ji, S., & Nha, H.

citation count

• 33

complete list of authors

• Kim, Ho-Joon||Lee, Su-Yong||Ji, Se-Wan||Nha, Hyunchul

publication date

• January 2012

publisher

• American Physical Society (APS)  Publisher

published in

• Physical Review A: Atomic, Molecular and Optical Physics  Journal

keywords

• Quant-ph

Digital Object Identifier (DOI)

• 10.1103/PhysRevA.85.013839

URI

• https://hdl.handle.net/1969.1/180960

start page

• 013839

volume

• 85

issue

• 1

URL

• http://dx.doi.org/10.1103/PhysRevA.85.013839