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Photons generated via spontaneous parametric down-conversion (SPDC) have broad spectrums and suffer from dispersive broadening of the temporal wave packets when they are transmitted through dispersive media. In this paper we theoretically and experimentally study the detailed amount of the temporal broadening of the two-photon wave packets generated via both type-I and type-II SPDC with β-BaB2O4 of...
Decoherence on two-qubit systems degrades entanglement, and sometimes even causes entanglement sudden death (ESD). We show quantum measurement reversal on only one subsystem can avoid ESD, providing methods for practical entanglement distribution under decoherence.
Decoherence on two-qubit systems degrades entanglement, and sometimes even causes entanglement sudden death (ESD). We show that quantum measurement reversal on only one subsystem can avoid ESD, providing methods for practical entanglement distribution under decoherence.
We report that quantum discord can be protected from decoherence by making use of weak and reversing quantum measurements, making it possible to distribute quantum correlation between two remote parties in noisy environment.
Quantum states can exhibit exchange symmetry; local quantum operations on the subsystems are exchangeable without affecting the quantum state. Here, we report that the exchange symmetry is broken once decoherence is introduced, even though the photons still share non-zero entanglement.
We propose and experimentally implement the delayed-choice decoherence suppression protocol. Using photonic entanglement, we successfully demonstrated that the choice to suppress decoherence can be delayed after decoherence and even after the detection of a qubit.
We investigate the conditions of an optimal measurement for estimating quantum states with minimal disturbance and maximal reversibility, and experimentally implement it in three-dimensional quantum states encoded by the single photon's polarization and path.
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