Photonic quantum simulator for unbiased phase covariant cloning

We present the results of a linear optics photonic implementation of a quantum circuit that simulates a phase covariant cloner, using two different degrees of freedom of a single photon. We experimentally simulate the action of two mirrored 1 → 2 cloners, each of them biasing the cloned states into...

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Bibliographic Details
Published in:Applied physics. B, Lasers and optics Lasers and optics, 2018, Vol.124 (1), p.1-7, Article 3
Main Authors: Knoll, Laura T., López Grande, Ignacio H., Larotonda, Miguel A.
Format: Article
Language:English
Subjects:
Applied physics
Cloning
Engineering
Hemispheres
Lasers
Masking
Optical Devices
Optics
Optimization
Photonics
Physical Chemistry
Physics
Physics and Astronomy
Quantum cryptography
Quantum Optics
Quantum theory
Qubits (quantum computing)
Simulation
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Summary:We present the results of a linear optics photonic implementation of a quantum circuit that simulates a phase covariant cloner, using two different degrees of freedom of a single photon. We experimentally simulate the action of two mirrored 1 → 2 cloners, each of them biasing the cloned states into opposite regions of the Bloch sphere. We show that by applying a random sequence of these two cloners, an eavesdropper can mitigate the amount of noise added to the original input state and therefore, prepare clones with no bias, but with the same individual fidelity, masking its presence in a quantum key distribution protocol. Input polarization qubit states are cloned into path qubit states of the same photon, which is identified as a potential eavesdropper in a quantum key distribution protocol. The device has the flexibility to produce mirrored versions that optimally clone states on either the northern or southern hemispheres of the Bloch sphere, as well as to simulate optimal and non-optimal cloning machines by tuning the asymmetry on each of the cloning machines.
ISSN:0946-2171
1432-0649
DOI:10.1007/s00340-017-6871-z