Report: Scientists `teleport` two photons

Jennifer M. Rice

Alamgir Khan, Jamal Shah

Through the process of quantum teleportation, a transfer of quantum information takes place from one particle to another while maintaining zero physical movement between the two. Quantum teleportation requires two entangled particles along with projective measurements followed by exchanging two bits of classical information. The process requires quantum mechanics principles which combine superposition with entanglement. Quantum entanglement occurs when two or more particles create an inseparable relationship that cuts off a separate description of an individual particle. Experimental realizations of quantum teleportation continue to operate on different physical platforms which include photons as well as atoms and superconducting circuits. Applications of Quantum teleportation includes quantum computing, secure communication, and cryptography. In future Scientists believe that a breakthrough in quantum computing technology could make teleportation a reality, including the ability to teleport a whole human. This paper provides the present research in quantum teleportation, including the theoretical framework, experimental implementations, and potential applications. We also discuss the challenges and limitations of quantum teleportation and propose future directions for research.

Nicolás Brehm, Katrin Kroeger, Natascha Hedrich

Johnson, Charles W.

Near the end of the Nineteenth Century a Prussian\nwoman arrived at her local telegraph office with a bowl of\nsauerkraut she wanted sent to her son. She insisted that,\nif soldiers could be sent to the front by telegraph, certainly\nher sauerkraut could be sent the same way. (Standage,\n1998)\nThe Prussian woman thought that communication\nand transportation could coincide. She may have been\ncorrect. In 1993 an IBM scientist, Charles H. Bennett,\npredicted that quantum teleportation is possible, but only if\nthe original object is destroyed. More recently, in October,\n1998, Caltech scientist H. Jeff Kimble succeeded in\ninstantaneously transporting information contained in the\nquantum state of a photon one meter across a lab bench\nwithout it traversing any physical medium in between.\nKimble and his colleagues used an extremely delicate\nquantum mechanical phenomenon, �quantum\nentanglement.� Kimble"s findings suggest that\nteleportation of the sort depicted in the Star Trek television\nseries and movies is theoretically possible.

Alexander Goebel

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.

Tony Greicius