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Results: 3

1.
Fig. 1.

Fig. 1. From: Realization of a Knill-Laflamme-Milburn controlled-NOT photonic quantum circuit combining effective optical nonlinearities.

The KLM NS gate. (A) If the NS gate succeeds it is heralded; indicated conceptually by the light globe. (B) The original KLM NS gate is heralded by detection of a photon at the upper detector and no photon at the lower detector. Gray indicates the surface of the BS from which a sign change occurs upon reflection. (C) A simplified KLM NS gate for which the heralding signal is detection of one photon.

Ryo Okamoto, et al. Proc Natl Acad Sci U S A. 2011 June 21;108(25):10067-10071.
2.
Fig. 3.

Fig. 3. From: Realization of a Knill-Laflamme-Milburn controlled-NOT photonic quantum circuit combining effective optical nonlinearities.

Experimental demonstration of a KLM CNOT gate. Left: ideal operation. Right: fourfold coincidence count rates (per 5,000 s) detected at DC, DT, DA1, and DA2. (A) For control qubit, |0Z〉 = |V〉, |1Z〉 = |H〉; for target qubit, , . “10” indicates C = 1 and T = 0. (B) For control qubit, , ; for target qubit, |0X〉 = |V〉, |1X〉 = |H〉. (C) For control qubit, , ; for target qubit, , . The events in which two pairs of photons are simultaneously incident to the ancillary inputs and no photons are incident to the signal inputs are subtracted, as confirmed by a reference experiment without input photons.

Ryo Okamoto, et al. Proc Natl Acad Sci U S A. 2011 June 21;108(25):10067-10071.
3.
Fig. 2.

Fig. 2. From: Realization of a Knill-Laflamme-Milburn controlled-NOT photonic quantum circuit combining effective optical nonlinearities.

The KLM CNOT gate. (A) The gate is constructed of two NS gates; the output is accepted only if the correct heralding signal is observed for each NS gate. Gray indicates the surface of the BS from which a sign change occurs upon reflection. (B) The KLM CNOT gate with simplified NS gate. (C) The same circuit as (B) but using polarization encoding and PPBSs. (D) The stable optical quantum circuit used here to implement the KLM CNOT gate using PPBSs and a displaced-Sagnac architecture. The target MZ, formed by BS11 and BS12 in Fig. 2B, can be conveniently incorporated into the state preparation and measurement, corresponding to a change of basis, as described in the caption to Fig. 3. The blue line indicates optical paths for vertically polarized components, and the red line indicates optical paths for horizontally polarized components.

Ryo Okamoto, et al. Proc Natl Acad Sci U S A. 2011 June 21;108(25):10067-10071.

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