Lidar
Range-Resolved Optical Remote Sensing of the Atmosphere
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Article
Experimental implementation of higher dimensional time–energy entanglement
Qudit entangled states have proven to offer significant advantages with respect to qubit states regarding the implementation of quantum cryptography or computation schemes. Here we propose and experimentally i...
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Article
Towards high-fidelity interference of photons emitted by two remotely trapped Rb-87 atoms
We investigate the requirements for achieving high-fidelity interference of photon pairs emitted by two independently trapped Rb-87 atoms at remote locations. For this purpose, one has to ensure indistin-guish...
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Article
Quantum memories
We perform a review of various approaches to the implementation of quantum memories, with an emphasis on activities within the quantum memory sub-project of the EU integrated project “Qubit Applications”. We b...
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Article
Entanglement-based quantum communication over 144 km
Quantum entanglement is the main resource to endow the field of quantum information processing with powers that exceed those of classical communication and computation. In view of applications such as quantum ...
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Article
An atom and a photon
The coherent control of single-photon emitters as, e.g., single ions or atoms, is a crucial element for map** quantum information between light and matter. The possibility of generating entanglement between ...
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Article
Experimental one-way quantum computing
Standard quantum computation is based on sequences of unitary quantum logic gates that process qubits. The one-way quantum computer proposed by Raussendorf and Briegel is entirely different. It has changed our...
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Book
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Book
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Article
High-fidelity source of four-photon entanglement
A polarisation-entangled four-photon state can be generated directly by a second order parametric down-conversion process. We use this emission to characterise the properties of a four-qubit state and to analy...
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Article
Experimental demonstration of complementarity with single photons
We demonstrate the principle of complementarity in quantum mechanics in a single-photon interference experiment. Single photons are provided by isolated, optically pumped nitrogen-vacancy centers in diamond, w...
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Chapter and Conference Paper
Efficient collection of polarization-entangled photons on type-II parametric down Conversion
We report on efficient collection of photon pairs from type-II parametric down conversion. We obtained 10000 polarization-entangled photon pairs per second in single mode optical fibers with a frequency-double...
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Chapter and Conference Paper
Four Photon Entanglement from Parametric Down Conversion
The emission of two photon pairs from type-II parametric down conversion results in a highly entangled 4-photon state. We describe the features of this new state and its application for the first 4-particle te...
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Article
A step towards global key distribution
Large random bit-strings known as 'keys' are used to encode and decode sensitive data, and the secure distribution of these keys is essential to secure communications across the globe1. Absolutely secure key exch...
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Chapter
Quantum Networks and Multi-Particle Entanglement
The basic concepts of quantum entanglement have been presented in previous chapters. In this chapter various advanced topics of quantum entanglement will be discussed. Section 6.2 describes a scheme for establ...
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Chapter
Quantum Dense Coding and Quantum Teleportation
In Chap. 2 it was shown how quantum entanglement can be used to distribute secret keys. In this chapter we will address other primitives of quantum communication employing entanglement. Section 3.2 describes “...
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Chapter
Quantum Cryptography
Human desire to communicate secretly is at least as old as writing itself and goes back to the beginnings of our civilisation. Methods of secret communication were developed by many ancient societies, includin...
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Article
Towards practical quantum cryptography
Quantum cryptography bases the security of quantum key exchange on the laws of quantum physics and is likely to become the first application employing quantum effects for communication. Here we present perform...
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Article
Experimental quantum teleportation of arbitrary quantum states
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Article
A posteriori teleportation
Bouwmeester et al. reply — Braunstein and Kimble observe correctly that, in the Innsbruck experiment, one does not always observe a teleported photon conditi...
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Chapter and Conference Paper
Quantum Optics with Mirrors
The close presence of a mirror can profoundly modify the spontaneous emission process. Here I describe some preliminary experiments with electrically pumped micro-cavities where we have shown enhancement and s...
