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Single-photon three-qubit quantum logic using spatial light modulators
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DOI：10.1038/s41467-017-00580-x.png)
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摘要
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The information-carrying capacity of a single photon can be vastly expanded by exploiting its multiple degrees of freedom: spatial, temporal, and polarization. Although multiple qubits can be encoded per photon, to date only two-qubit single-photon quantum operations have been realized. Here, we report an experimental demonstration of three-qubit single-photon, linear, deterministic quantum gates that exploit photon polarization and the two-dimensional spatial-parity-symmetry of the transverse single-photon field. These gates are implemented using a polarization-sensitive spatial light modulator that provides a robust, non-interferometric, versatile platform for implementing controlled unitary gates. Polarization here represents the control qubit for either separable or entangling unitary operations on the two spatial-parity target qubits. Such gates help generate maximally entangled three-qubit Greenberger-Horne-Zeilinger and W states, which is confirmed by tomographical reconstruction of single-photon density matrices. This strategy provides access to a wide range of three-qubit states and operations for use in few-qubit quantum information processing protocols.
Keyword:
COHERENCY MATRIX TOMOGRAPHY
LINEAR OPTICS
DOVE PRISMS
POLARIZATION
COMPUTATION
QUBITS
GATES
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15.7
论文数:
9.3W
被引数:
91.2W
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