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Experimental demonstration of five-photon entanglement and open-destination teleportation

Zhang An

Published Jan 1, 2005• 0 citations
OpenAlex

Abstract

Based on the technique developed in previous multi-photon interferometry, we experimentally combine an entangled four-photon state with a single photon state to achieve the first ever entanglement of five photons in the world. And then making use of this five-photon source, we also demonstrate a novel type of quantum teleportation, called open-destination teleportation. Our experiment result is of great importance in experimental test of some fundamental problems in quantum mechanics, information theory, cryptography, and quantum computation etc. Also our experimental method will greatly promote the study of distributed quantum communication, linear-optics based quantum computation, and experimental test of some fundamental problems in quantum mechanics etc.

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Based on the technique developed in previous multi-photon interferometry, we experimentally combine an entangled four-photon state with a single photon state to achieve the first ever entanglement of five photons in the world. And then making use of this five-photon source, we also demonstrate a novel type of quantum teleportation, called open-destination teleportation. Our experiment result is of great importance in experimental test of some fundamental problems in quantum mechanics, information theory, cryptography, and quantum computation etc. Also our experimental method will greatly promote the study of distributed quantum communication, linear-optics based quantum computation, and experimental test of some fundamental problems in quantum mechanics etc.
We report the experimental manipulation of five-photon entanglement. In the experiment, we first generate a high intensity and ultra-stable source of entangled photons and then used two pairs of entangled photons to produce a four-photon entangled state. After combining it with a single-photon state, we are able to engineer a five-photon entangled state. Meanwhile, by manipulating these entangled states, we have also successfully demonstrated the open-destination quantum teleportation, and a distant nondestructive Controlled-NOT gate for quantum teleportation.
We experimentally demonstrate observation of highly pure four-photon GHZ entanglement produced by parametric down-conversion and a projective measurement. At the same time this also demonstrates teleportation of entanglement with very high purity. Not only does the achieved high visibility enable various novel tests of quantum nonlocality, it also opens the possibility to experimentally investigate various quantum computation and communication schemes with linear optics. Our technique can, in principle, be used to produce entanglement of arbitrarily high order or, equivalently, teleportation and entanglement swapping over multiple stages.
Over the last twenty years the field of quantum information processing (QIP) has attracted the attention of many scientists, due to the promise of impressive improvements in the areas of computational speed, communication security and the ability to simulate nature on the micro scale. This thesis describes an experimental work on the physics of multi-photon entanglement and its application in the field of QIP. We have thoroughly developed the necessary techniques to generate multipartite entanglement between up to six photons. By exploiting the developed six-photon interferometer, in this thesis we report for the first time the experimental quantum teleportation of a two-qubit composite system, the realization of multi-stage entanglement swapping, the implementation of a teleportation-based controlled-NOT gate for fault-tolerant quantum computation, the first generation of entanglement in sixpartite photonic graph states and the realization of ‘one-way’ quantum computation with two-photon four-qubit cluster states. The methods developed in these experiments are of great significance both for exploring the field of QIP and for future experiments on the fundamental tests of quantum mechanics.
The project "Multi-Photon Entanglement and Quantum Teleportation" concerns a series of experimental and theoretical investigations on multi-photon entangled states and the applications, for example, quantum teleportation. The objective of this research is to probe the foundations of quantum;theory of entanglement and its fundamental roles in quantum computing and quantum information processing. This research will definitely benefit many scientific and engineering discipline applications. This report is for the first year investigation of a long term basic research program. The efforts of the first year research are very important for the achievement of our long term goal. Based on the successful results of the first year research, a novel teleportation experiment which has the ability to provide a true "100% teleportation" shall be conducted in the second year.
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Multiphoton interference reveals strictly nonclassical phenomena. Its applications range from fundamental tests of quantum mechanics to photonic quantum information processing, where a significant fraction of key experiments achieved so far comes from multiphoton state manipulation. The progress, both theoretical and experimental, of this rapidly advancing research is reviewed. The emphasis is given to the creation of photonic entanglement of various forms, tests of the completeness of quantum mechanics (in particular, violations of local realism), quantum information protocols for quantum communication (e.g., quantum teleportation, entanglement purification, and quantum repeater), and quantum computation with linear optics. The scope of the review is limited to ``few-photon'' phenomena involving measurements of discrete observables.