Deterministically encoding quantum information using 100-photon Schrödinger cat states

Abstract : 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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https://hal.inria.fr/hal-00924537
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Submitted on : Monday, January 6, 2014 - 10:12:42 PM
Last modification on : Monday, December 10, 2018 - 3:24:05 PM

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Brian Vlastakis, Gerhard Kirchmair, Zaki Leghtas, S.E. Nigg, Luigi Frunzio, et al.. Deterministically encoding quantum information using 100-photon Schrödinger cat states. Science, American Association for the Advancement of Science, 2013, 342 (6158), pp.607-610. ⟨10.1126/science.1243289⟩. ⟨hal-00924537⟩

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