In addition, high counting rate single-photon detectors are assumed for quantum state measurement29,30. In this case, the photon counting saturation issue is negligible, and there is no constraint on the value of \(\mu _1\). The simulation results are shown as the blue and red curve in ...
In the context of quantum technologies, the generation and manipulation of single photons has become a key element for applications such as quantum communication and quantum computing, as well as quantum metrology, biology and experiments probing the foundations of quantum physics discussed in an accomp...
(I) The partial Bell state measurements are implemented through two-photon interference, using PBS and HWP plates set at 22.5∘. Beam splitters (BS) are introduced to estimate the projection probabilities before single photon detectors (actively quenched Si-avalanche photodiodes, DET). Outcome b...
There is no doubt that decoherence is essential to explain why quantum interference effects do not show up for macroscopic objects. But this is not the problem here. The point is that—and this is perhaps the right place to use Bohr’s and Heisenberg’s terminology—decoherence processes do ...
If 1 & 4 arrive at their detectors simultaneously, so will 2 & 3. That's because 1 & 4 traveled the same distance relative to each other, and so did 2 & 3 relative to each other. So they will all appear in the same adjusted time window. b) If Alice and Bob are checking ...
The φ-parameters in ρL1R1 and ρL2R2 are the same provided that the two states are established over the same stationary channels. We register only the coincidences of the two-side detectors, so the protocol is successful only if there is a click on each side. Under this condition, the...
As classical computation and communication speed up beyond the microsecond range, slower physical measurements of matter-based qubits will hinder the reaction time, while fast single-photon detectors won’t face the same bottleneck. In the standard photonic architecture we saw that would scale ...
Waveplate:flipsthespinofparticlespassingslit2,withoutaffectinglinearmomentum.Stillnointerference–becausewecouldcheckthespinoftheparticle,anddiscoverwhichslitithadtraversed.Musttherebeadisturbance?Bohr:MeasurementofXdisturbsP;etceteraMeasurementmeansamplificationofaquantumphenomenonbyinteractionwithsome“large”(classical)...
How good must single photon sources and detectors be for efficient linear optical quantum computation? Phys. Rev. Lett. 100, 060502 (2008). Article ADS Google Scholar Gasparoni, S., Pan, J.-W., Walther, P., Rudolph, T. & Zeilinger, A. Realization of a photonic controlled-NOT gate ...
It also provides a self-consistency check between the two methods, thus demonstrating the applicability of FDP method to characterization of many-outcome detectors and QSE. Figure 3: Non-classical state reconstruction. Reconstructed Wigner functions W(X,P) from FDP method (a–c) and photon number...