Deterministic generation of many-photon GHZ states using quantum dots in a cavity

Michael N. Leuenberger; Mikhail Erementchouk

doi:10.1117/12.2050905

28 May 2014 Deterministic generation of many-photon GHZ states using quantum dots in a cavity

Michael N. Leuenberger, Mikhail Erementchouk

Proceedings Volume 9123, Quantum Information and Computation XII; 91230I (2014) https://doi.org/10.1117/12.2050905
Event: SPIE Sensing Technology + Applications, 2014, Baltimore, MD, United States

Abstract

Compared to classical light sources, quantum sources based on N00N states consisting of N photons achieve an N-times higher phase sensitivity, giving rise to super-resolution.^{1, 2, 3} N00N-state creation schemes based on linear optics and projective measurements only have a success probability p that decreases exponentially with N,4, 5, 6 e.g. p = 4.4x10^-14for N = 20.⁷ Feed-forward improves the scaling but N fluctuates nondeterministically in each attempt.^{8, 9} Schemes based on parametric down-conversion suffer from low production efficiency and low fidelity.⁹ A recent scheme based on atoms in a cavity combines deterministic time evolution, local unitary operations, and projective measurements.¹⁰ Here we propose a novel scheme based on the off-resonant interaction of N photons with four semiconductor quantum dots (QDs) in a cavity to create GHZ states, also called polarization N00N states, deterministically with p = 1 and fidelity above 90% for N≤ 60, without the need of any projective measurement or local unitary operation. Using our measure we obtain maximum N-photon entanglement E_N = 1 for arbitrary N. Our method paves the way to the miniaturization of N00N and GHZ-state sources to the nanoscale regime, with the possibility to integrate them on a computer chip based on semiconductor materials.

Citation Download Citation

Michael N. Leuenberger and Mikhail Erementchouk "Deterministic generation of many-photon GHZ states using quantum dots in a cavity", Proc. SPIE 9123, Quantum Information and Computation XII, 91230I (28 May 2014); https://doi.org/10.1117/12.2050905

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KEYWORDS

Photons

Electroluminescent displays

Quantum dots

Polarization

Chemical species

Magnetism

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