Fully Entangled Macroscopic Light Pulses of 10^5 Photons

Details Fully Entangled Macroscopic Light Pulses of 10^5 Photons Fully Entangled Macroscopic Light Pulses of 10^5 Photons

2011-11-08

arxiv.org/abs/1111.2073v3

Physics

Quantum Physics

5 pages, 4 figures

Scientific paper

Entanglement is the signature of the quantum world. One part of an entangled system has its properties fully undefined yet fully correlated with the properties of its counterpart [1]. Can this behavior be observed for large objects? Recently, entanglement was discovered for macroscopic material systems [2, 3]. It is very tempting to observe it for bright photonic states [4, 5] because light interacts the more efficiently the more photons it contains. For bright squeezed vacuum, very different from usual squeezed light, entanglement was discussed theoretically [6-10] but never tested experimentally. Coincidence measurements could only reveal entanglement for up to 12 photons [11]. Here we experimentally demonstrate entanglement for squeezed vacuum pulses containing more than 10^5 photons. We also calculate their Schmidt number and measure its operational counterpart [12]. Theoretically, our pulses are the more entangled the brighter they are. This promises important applications in quantum technologies, especially photonic quantum gates and quantum memories [13].

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