Deterministically Encoding Quantum Information Using 100-Photon Schrödinger Cat States.

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Bibliographic Details
Title:	Deterministically Encoding Quantum Information Using 100-Photon Schrödinger Cat States.
Authors:	Vlastakis, Brian, Kirchmair, Gerhard, Leghtas, Zaki, Nigg, Simon E., Frunzio, Luigi, Girvin, S. M., Mirrahimi, Mazyar, Devoret, M. H., Schoelkopf, R. J.
Source:	Science (pre-March 2025). 11/1/2013, Vol. 342 Issue 6158, p607-610. 4p.
Subjects:	Quantum information science, Qubits, Multiphoton processes, Cavity resonators, Superposition principle (Physics), Coherent states, Quantum electrodynamics
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. [ABSTRACT FROM AUTHOR]
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Database:	Psychology and Behavioral Sciences Collection

Description
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. [ABSTRACT FROM AUTHOR]
ISSN:	00368075
DOI:	10.1126/science.1243289