Publications by Brian Vlastakis


Deterministically encoding quantum information using 100-photon Schrödinger cat states.

Science (New York, N.Y.) 342 (2013) 607-610

B Vlastakis, G Kirchmair, Z Leghtas, SE Nigg, L Frunzio, SM Girvin, M Mirrahimi, MH Devoret, RJ Schoelkopf

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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