101 research outputs found
Light People: Professor Guangcan Guo
No full textProf. Guangcan Guo took it upon himself to delve into quantum optics and quantum informatics, which helped to accelerate the development of quantum science in China
640-Gbit/s fast physical random number generation using a broadband chaotic semiconductor laser
No full textAbstractAn ultra-fast physical random number generator is demonstrated utilizing a photonic integrated device based broadband chaotic source with a simple post data processing method. The compact chaotic source is implemented by using a monolithic integrated dual-mode amplified feedback laser (AFL) with self-injection, where a robust chaotic signal with RF frequency coverage of above 50 GHz and flatness of ±3.6 dB is generated. By using 4-least significant bits (LSBs) retaining from the 8-bit digitization of the chaotic waveform, random sequences with a bit-rate up to 640 Gbit/s (160 GS/s × 4 bits) are realized. The generated random bits have passed each of the fifteen NIST statistics tests (NIST SP800-22), indicating its randomness for practical applications.</jats:p
Linearly Chirped Microwave Generation Using a Monolithic Integrated Amplified Feedback Laser
No full textTeleportation of an arbitrary two-particle state via entanglement swapping
No full textA scheme of teleportation of an arbitrary two-particle state is presented when two pairs of entangled particles are used as quantum channels. After the Bell state measurements are operated by the sender, the original state with deterministic probability can be reconstructed by the receiver when a corresponding unitary transformation is followed
Necessary and sufficient condition for Markovian-dissipative-dynamics-induced quantum discord
No full textA Markovian dissipative quantum channel can generate quantum discord from some bipartite product states if and only if it cannot be reduced to individual decoherence channels independently acting on each qudit. As a byproduct, we also prove that proper individual decoherence can transform the classical correlation into quantum discord. Our result builds a tight connection between quantum discord and collective decoherence.OpticsPhysics, Atomic, Molecular & ChemicalSCI(E)EI23ARTICLE2null8
Generation of two-mode entanglement between separated cavities
No full textWe propose a scheme for the generation of two-mode entangled states between two spatially separated cavities. It utilizes a two-level atom sequentially coupling to two high-Q cavities with strong classical driving fields. By suitably choosing the intensities and detunings of the fields and precisely controlling the dynamics, entangled coherent states and Bell states can be produced between the modes of the two cavities. The entangled states should have applications in quantum information processin. (C) 2008 Optical Society of AmericaOpticsSCI(E)EI1ARTICLE1189-1932
Enhancing the entanglement of a teleported state by local collective noises
No full textWe show that the entanglement of the two-qubit teleported state via a class of four-qubit entangled channel states can be increased by collective amplitude damping locally acting on one part of the channel state. Specifically, we compare the entanglement contained in the output state of teleportation before and after the action of the collective amplitude damping on the channel state, and show that for a wide range of input entangled two-qubit states, the local decoherence can result in an increase in the output entanglement. In this process, the average fidelity of the teleportation is also increased. Our result reveals that some quantum properties of the four-qubit channel state are definitely improved in the process of enhancing the fidelity by local noise.OpticsPhysics, Atomic, Molecular & ChemicalSCI(E)EI0ARTICLE7null4
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