Physics – Quantum Physics
Scientific paper
2008-06-18
Physical Review Letters 101, 233605 (2008)
Physics
Quantum Physics
5 pages, 4 figures; the revised version
Scientific paper
10.1103/PhysRevLett.101.233605
We propose and demonstrate a novel method to generate a large-amplitude coherent-state superposition (CSS) via ancilla-assisted photon-subtraction. The ancillary mode induces quantum interference of indistinguishable processes, widening the controllability of quantum superposition at the conditional output. We demonstrate the concept in the time domain, by a simple time-separated two-photon subtraction from cw squeezed light. We observe the largest CSS ever reported without any corrections, which will enable various quantum information applications with CSS states.
Furusawa Akira
Hayasaka Kazuhiro
Sasaki Masahide
Suzuki Shigenari
Takahashi Hiroki
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