Journal
PHYSICAL REVIEW A
Volume 84, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.84.060301
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Funding
- NIST Quantum Information Initiative
- EPSRC (Engineering and Physical Sciences Research Council) [GR/S82176/01]
- EU
- Engineering and Physical Sciences Research Council [GR/S82176/01, EP/H03031X/1] Funding Source: researchfish
- EPSRC [EP/H03031X/1] Funding Source: UKRI
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Integration is currently the only feasible route toward scalable photonic quantum processing devices that are sufficiently complex to be genuinely useful in computing, metrology, and simulation. Embedded on-chip detection will be critical to such devices. We demonstrate an integrated photon-number-resolving detector, operating in the telecom band at 1550 nm, employing an evanescently coupled design that allows it to be placed at arbitrary locations within a planar circuit. Up to five photons are resolved in the guided optical mode via absorption from the evanescent field into a tungsten transition-edge sensor. The detection efficiency is 7.2 +/- 0.5%. The polarization sensitivity of the detector is also demonstrated. Detailed modeling of device designs shows a clear and feasible route to reaching high detection efficiencies.
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