Deterministically Encoding Quantum Information Using 100-Photon Schrödinger Cat States

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Science  26 Sep 2013:
DOI: 10.1126/science.1243289

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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 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 toolset of conditional qubit-photon logic, we map an arbitrary qubit state to a superposition of coherent states, known as a "cat state." We create cat states as large as 111 photons and extend 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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