Abstract
We experimentally demonstrated entanglement extraction scheme by using photons at the telecommunication band for optical-fiber-based quantum communications. We generated two pairs of non-degenerate polarization entangled photons at 780 nm and 1551 nm by spontaneous parametric down-conversion and distributed the two photons at 1551 nm through a collective phase damping channel which gives the same amount of random phase shift on the two photons. Through local operation and classical communication, we extracted an entangled photon pair from two phase-disturbed photon pairs. An observed fidelity of the extracted photon pair to a maximally entangled photon pair was 0.73 ± 0.07 which clearly shows the recovery of entanglement.
Highlights
Faithful distribution of photonic entangled states between two distant parties is one of the significant issues in the field of quantum information processing such as quantum teleportation [1], superdense coding [2] and entanglement-based quantum key distribution [3]
We report an experimental demonstration of the entanglement extraction based on linear optics and a post-selection [7] by using two non-degenerated photon pairs at a visible wavelength of 780 nm and a telecom wavelength of 1551 nm
The sender Alice keeps the two visible photons and sends the two telecom photons to the receiver Bob through a collective phase damping channel (CPC) which adds the same phase shifts to the two photons. Such a collective noise channel appears in many practical situations [12,13,14] and discussed in many quantum communication protocols, such as reference-frame-free quantum communication [15,16,17,18], decoherence-free quantum communication [19,20,21,22,23] and computation [24,25]
Summary
Faithful distribution of photonic entangled states between two distant parties is one of the significant issues in the field of quantum information processing such as quantum teleportation [1], superdense coding [2] and entanglement-based quantum key distribution [3]. The sender Alice keeps the two visible photons and sends the two telecom photons to the receiver Bob through a collective phase damping channel (CPC) which adds the same phase shifts to the two photons. Such a collective noise channel appears in many practical situations [12,13,14] and discussed in many quantum communication protocols, such as reference-frame-free quantum communication [15,16,17,18], decoherence-free quantum communication [19,20,21,22,23] and computation [24,25]. An observed fidelity of the extracted photon pairs to a maximally entangled state is 0.73 ± 0.07, which shows extraction of the entanglement from two phase-disturbed photon pairs shared between Alice and Bob
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