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Faithful conversion of propagating quantum information to mechanical motion
Ist Teil von
Nature physics, 2017-12, Vol.13 (12), p.1163-1167
Ort / Verlag
London: Nature Publishing Group UK
Erscheinungsjahr
2017
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
Combining micrometre-sized mechanical resonators with superconducting quantum circuits, quantum information encoded with photons now can be converted to the motion of a macroscopic object.
The motion of micrometre-sized mechanical resonators can now be controlled and measured at the fundamental limits imposed by quantum mechanics. These resonators have been prepared in their motional ground state
1
,
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,
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or in squeezed states
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,
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,
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, measured with quantum-limited precision
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, and even entangled with microwave fields
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. Such advances make it possible to process quantum information using the motion of a macroscopic object. In particular, recent experiments have combined mechanical resonators with superconducting quantum circuits to frequency-convert, store and amplify propagating microwave fields
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,
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,
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,
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. But these systems have not been used to manipulate states that encode quantum bits (qubits), which are required for quantum communication and modular quantum computation
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,
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. Here we demonstrate the conversion of propagating qubits encoded as superpositions of zero and one photons to the motion of a micromechanical resonator with a fidelity in excess of the classical bound. This ability is necessary for mechanical resonators to convert quantum information between the microwave and optical domains
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,
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,
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or to act as storage elements in a modular quantum information processor
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,
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,
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. Additionally, these results are an important step towards testing speculative notions that quantum theory may not be valid for sufficiently massive systems
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.