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Demonstration of efficient scheme for generation of "Event Ready" entangled photon pairs from single photon source
Qiang Zhang, Xiao-Hui Bao, Chao-Yang Lu +4
We present a feasible and efficient scheme, and its proof-of-principle demonstration, of creating entangled photon pairs in an event-ready way using only simple linear optical elem…
Optical Nondestructive Controlled-NOT Gate without Using Entangled Photons
Xiao-Hui Bao, Teng-Yun Chen, Qiang Zhang +4
We present and experimentally demonstrate a novel optical nondestructive controlled-NOT gate without using entangled ancilla. With much fewer measurements compared with quantum pro…
Non-local generation of entanglement of photons which do not meet each other
Juergen Roesch, Xian-Min Jing, Juan Yin +2
We report for the first time in an ancilla-free process a non-local entanglement between two single photons which do not meet. For our experiment we derive a simple and efficient m…
Experimental entanglement of six photons in graph states
Chao-Yang Lu, Xiao-Qi Zhou, Otfried Gühne +6
Graph states are special kinds of multipartite entangled states that correspond to mathematical graphs where the vertices take the role of quantum spin systems and the edges repres…
Experimental Quantum Teleportation of a Two-Qubit Composite System
Qiang Zhang, Alexander Goebel, Claudia Wagenknecht +6
Quantum teleportation, a way to transfer the state of a quantum system from one location to another, is central to quantum communication and plays an important role in a number of…
Robust creation of entanglement between remote memory qubits
Bo Zhao, Zeng-Bing Chen, Yu-Ao Chen +2
In this Letter we propose a robust quantum repeater architecture building on the original DLCZ protocol [L.M. Duan \textit{et al.}, Nature \textbf{414}, 413 (2001)]. The architectu…
Fault-tolerant quantum repeater with atomic ensembles and linear optics
Zeng-Bing Chen, Bo Zhao, Yu-Ao Chen +2
We present a detailed analysis of a new robust quantum repeater architecture building on the original DLCZ protocol [L.M. Duan \textit{et al.}, Nature (London) \textbf{414}, 413 (2…
Simple protocol for secure decoy-state quantum key distribution with a loosely controlled source
Xiang-Bin Wang, Cheng-Zhi Peng, Jian-Wei Pan
The method of decoy-state quantum key distribution (QKD) requests different intensities of light pulses. Existing theory has assumed exact control of intensities. Here we propose a…
Collisional decoherence during writing and reading quantum states
Stephanie Manz, Thomas Fernholz, Joerg Schmiedmayer +1
Collisions, even though they do not limit the lifetime of quantum information stored in ground state hyperfine coherences, may severely limit the fidelity for quantum memory when t…
Experimental Violation of Bell Inequality beyond Cirel'son's Bound
Yu-Ao Chen, Tao Yang, An-Ning Zhang +3
The correlations between two qubits belonging to a three-qubit system can violate the Clauser-Horne-Shimony-Holt-Bell inequality beyond Cirel'son's bound [A. Cabello, Phys. Rev. Le…
A Deterministic and Storable Single-Photon Source Based on Quantum Memory
Shuai Chen, Yu-Ao Chen, Thorsten Strassel +4
A single photon source is realized with a cold atomic ensemble (Rb atoms). In the experiment, single photons, which is initially stored in an atomic quantum memory generated…
Experimental Long-Distance Decoy-State Quantum Key Distribution Based On Polarization Encoding
Cheng-Zhi Peng, Jun Zhang, Dong Yang +7
We demonstrate the decoy-state quantum key distribution (QKD) with one-way quantum communication in polarization space over 102km. Further, we simplify the experimental setup and u…
Experimental Quantum Communication without a Shared Reference Frame
Teng-Yun Chen, Jun Zhang, J. -C. Boileau +6
We present an experimental realization of a robust quantum communication scheme [Phys. Rev. Lett. 93, 220501 (2004)] using pairs of photons entangled in polarization and time. Our…
Beamsplitting attack to the revised KKKP protocol and a possible solution
Xiang-Bin Wang, Qiang Zhang, Yu-Ao Chen +3
We show that the revised KKKP protocol proposed by Kye and Kim [Phys. Rev. Lett. 95,040501(2005)] is still insecure with coherent states by a type of beamsplitting attack. We then…