Efficient noiseless linear amplification for light fields with larger amplitudes

Jinwoo Park, Jaewoo Joo, Alessandro Zavatta, Marco Bellini, Hyunseok Jeong

Research output: Contribution to journalArticlepeer-review


We suggest and investigate a scheme for non-deterministic noiseless linear amplification of coherent states using successive photon addition, (â†)2, where ↠is the photon creation operator. We compare it with a previous proposal using the photon addition-then-subtraction, ââ†, where â is the photon annihilation operator, that works as an appropriate amplifier only for weak light fields. We show that when the amplitude of a coherent state is |α| >∼ 0.91, the (â†)2 operation serves as a more efficient amplifier compared to the â↠operation in terms of equivalent input noise. Using â↠and (â†)2 as basic building blocks, we compare combinatorial amplifications of coherent states using (ââ†)2, â†4, â↠â†2, and â†2ââ†, and show that (ââ†)2, â†2ââ†, and â†4 exhibit strongest noiseless properties for |α| >∼ 0.51, 0.51 <∼ |α| <∼ 1.05, and |α| >∼ 1.05, respectively. We further show that the (â†)2 operation can be useful for amplifying superpositions of the coherent states. In contrast to previous studies, our work provides efficient schemes to implement a noiseless amplifier for light fields with medium and large amplitudes.

Original languageEnglish
Pages (from-to)1331-1346
Number of pages16
JournalOptics Express
Issue number2
Publication statusPublished - 15 Jan 2016


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