Single-photon three-qubit quantum logic using spatial light modulators

Kumel H. Kagalwala, Giovanni Giuseppe, Ayman F. Abouraddy () and Bahaa E. A. Saleh
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Kumel H. Kagalwala: University of Central Florida
Giovanni Giuseppe: University of Central Florida
Ayman F. Abouraddy: University of Central Florida
Bahaa E. A. Saleh: University of Central Florida

Nature Communications, 2017, vol. 8, issue 1, 1-11

Abstract: Abstract 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.

Date: 2017
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DOI: 10.1038/s41467-017-00580-x

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