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The quantum controlled-not gate is an example of the maximally entangling gate, which is a broad class of operations that are necessary for scalable linear optics quantum computation. Here, we characterize a telecommunications-wavelength (1550 nm) quantum controlled- not gate, and for the first time, experimentally bound its process fidelity by measuring its operation in two complementary polarization...
We present a method for graphically visualizing any two-qubit quantum state. This tool, based on the Poincare sphere, provides an unambiguous, intuitive, and useful compliment to photonic state tomography.
We demonstrate the generation of high-quality entangled photon pairs in the 1310-nm O-band. Using an ultra-stable source design, we produce polarization entanglement with 97.5% fidelity as characterized via coincidence basis tomography.
We experimentally characterize a linear optics, telecom-band quantum controlled-NOT gate using a fiber-based source of degenerate photon pairs, and bound its process fidelity to 0.907 les Fp les 0.948.
Visible light photon counters (VLPCs) and solid-state photomultipliers (SSPMs) facilitate efficient single-photon detection. We are attempting to improve their efficiency, previously limited to > 88% by coupling losses, via anti-reflection coatings, better electronics and cryogenics.
Frequency up- and down-conversion in nonlinear crystals enables several fundamental resources for optical quantum information, including on-demand single photons, entangled-photon states, and efficient conversion of photons' quantum states from one wavelength to another
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