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We have developed the technique of two-photon joint temporal density measurements for temporal state characterization, thus facilitating two-photon generation with high temporal entanglement or nearly factorizable outputs by controlling the ultrafast pump bandwidth.
Continuous channel waveguides in periodically poled KTiOPO4 with guided orthogonal polarizations are used to demonstrate type-II background-free second harmonic generation at 1505 nm with 1.2 %/(W cm2) normalized efficiency.
We demonstrate a new type of optical coherence tomography using only classical resources to achieve results that are typically associated with quantum-enhanced metrology: factor-of-two axial resolution enhancement and even-order dispersion cancellation.
Polarization-entangled photons at 1.3 mum from a fiber-coupled PPKTP waveguide are analyzed using a remotely located superconducting nanowire single-photon detector, yielding 97.5% quantum-interference visibility and 0.8 coincidence/s at 96 muW pump power.
We demonstrate a new technique of efficient, time-resolved, infrared single-photon detection using non collinearly phase-matched frequency upconversion by an ultrafast pump, allowing nearly background-free sub-picosecond characterization of 1582-nm time anti-correlated entangled photons.
We report efficient picosecond UV generation by means of frequency quadrupling of an amplified picosecond fiber laser. This narrowband 390-nm source with 250 mW is suitable for a number of quantum information processing tasks.
We have produced spectrally-bright polarization-entangled biphotons using a cavity-enhanced type-II PPKTP parametric downconverter. By detuning the cavity birefringence we have generated a novel time-bin dependent polarization-entangled biphoton state.
We report on dynamical signatures of signal/idler self phase-locking in a cw frequency divide-by-three optical parametric oscillator subject to two competing chi(2) nonlinear processes, confirming the theoretical predictions
We have implemented a SWAP gate to transfer entanglement from the momentum to the polarization degree of freedom of down-converted photon pairs. The polarization-entangled pairs thus created violate Bell's inequality by more than 150 standard deviations
We have achieved continuous-wave operation of efficient single-photon detection at 1.55 mum by sum-frequency mixing with a strong pump at 1064 nm in bulk periodically-poled lithium niobate followed by photon counting in the visible
Using linear optical elements we have demonstrated a deterministic controlled-NOT gate for a quantum logic protocol that uses the polarization and momentum degrees of freedom of a single photon as the control and target qubits
We report on dynamical signatures of signal/idler self phase-locking in a cw frequency divide-by-three optical parametric oscillator subject to two competing /spl chi//sup (2)/ nonlinear processes, confirming the theoretical predictions.
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