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Vlastakis, Brian; Kirchmair, Gerhard; Leghtas, Zaki; Nigg, Simon E.; Frunzio, Luigi; Girvin, S. M.; Mirrahimi, Mazyar; Devoret, M. H.; Schoelkopf, R. J.
Science (American Association for the Advancement of Science), 11/2013, Letnik: 342, Številka: 6158Journal Article
In contrast to a single quantum bit, an oscillator can store multiple excitations and coherences provided one has the ability to generate and manipulate complex multiphoton states. We demonstrate multiphoton control by using a superconducting transmon qubit coupled to a waveguide cavity resonator with a highly ideal off-resonant coupling. This dispersive interaction is much greater than decoherence rates and higher-order nonlinearities to allow simultaneous manipulation of hundreds of photons. With a tool set of conditional qubit-photon logic, we mapped an arbitrary qubit state to a superposition of coherent states, known as a "cat state." We created cat states as large as 111 photons and extended this protocol to create superpositions of up to four coherent states. This control creates a powerful interface between discrete and continuous variable quantum computation and could enable applications in metrology and quantum information processing.
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