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Controlled Phase Gate Between a Single Atom and an Optical Photon
This thesis reports on major steps towards the realization of scalable quantum networks. It addresses the experimental implementation of a deterministic interaction mechanism between flying optical photons and a single trapped atom. In particular, it demonstrates the nondestructive detection of an optical photon. To this end, single rubidium atoms are trapped in a three-dimensional optical lattice at the center of an optical cavity in the strong coupling regime. Full control over the atomic state — its position, its motion, and its electronic state — is achieved with laser beams applied along the resonator and from the side. When faint laser pulses are reflected from the resonator, the combined atom-photon state acquires a state-dependent phase shift. In a first series of experiments, this is employed to nondestructively detect optical photons by measuring the atomic state after the reflection process. Then, quantum bits are encoded in the polarization of the laser pulse and in the Zeeman state of the atom. The state-dependent phase shift mediates a deterministic universal quantum gate between the atom and one or two successively reflected photons, which is used to generate entangled atom-photon, atom-photon-photon, and photon-photon states out of separable input states.
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Genesis of the GATT
This book is part of a wider project on the economic logic behind the General Agreement on Tariffs and Trade (GATT). This volume asks: What does the historical record indicate about the aims and objectives of the framers of the GATT? Where did the provisions of the GATT come from and how did they evolve through various international meetings and drafts? To what extent does the historical record provide support for one or more of the economic rationales for the GATT? This book examines the motivations and contributions of the two main framers of the GATT, the United States and the United Kingdom, as well as the smaller role of other countries. The framers desired a commercial agreement on trade practices as well as negotiated reductions in trade barriers. Both were sought as a way to expand international trade to promote world prosperity, restrict the use of discriminatory policies to reduce conflict over trade, and thereby establish economic foundations for maintaining world peace.
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Controlled Phase Gate Between a Single Atom and an Optical Photon
This thesis reports on major steps towards the realization of scalable quantum networks. It addresses the experimental implementation of a deterministic interaction mechanism between flying optical photons and a single trapped atom. In particular, it demonstrates the nondestructive detection of an optical photon. To this end, single rubidium atoms are trapped in a three-dimensional optical lattice at the center of an optical cavity in the strong coupling regime. Full control over the atomic state — its position, its motion, and its electronic state — is achieved with laser beams applied along the resonator and from the side. When faint laser pulses are reflected from the resonator, the combined atom-photon state acquires a state-dependent phase shift. In a first series of experiments, this is employed to nondestructively detect optical photons by measuring the atomic state after the reflection process. Then, quantum bits are encoded in the polarization of the laser pulse and in the Zeeman state of the atom. The state-dependent phase shift mediates a deterministic universal quantum gate between the atom and one or two successively reflected photons, which is used to generate entangled atom-photon, atom-photon-photon, and photon-photon states out of separable input states.
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