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Journal of International Crisis and Risk Communication Research

Highly Efficient Eigenstate-Assisted Long-Distance Quantum State Transfer in Photonic Lattices

Armando Pérez-Leija, Markus Gräfe, René Heilmann, Robert Keil, Simon Stützer, Steffen Weimann, Demetrios N. Christodoulides, Alexander Szameit

Published Jan 1, 2014• 0 citations
Publisher

Abstract

We introduce a new perfect state transfer protocol based on single-photon W-eigenstates of photonic lattices. Such W-eigenstates appear as impulse response of the system, e.g., when single photons are launched into single sites.
DOI
10.1364/cleo_qels.2014.ff2d.4

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We propose a quantum network consisting of optical waveguides in the linear regime for quantum state transfer. The circular topology of our network introduces novel functionalities that enable us to analytically identify the conditions under which perfect state transfer (PST) is achievable. We utilize the properties of the Fourier modes, in particular the zero Fourier modes, which provide a protected subspace for the efficient propagation of quantum states, resulting in PST to the diametrically opposite site in a network with any number of sites N=4nN = 4nN=4n. The coupling profiles in the photonic network modulate the number of zero-energy eigenmodes, with uniform couplings yielding more than evanescent ones, confirming that the expedition of observed PST originates from the collapse of the eigenvalue spectrum into three distinct eigenvalue blocks, including N/2N/2N/2 manifolds of zero Fourier modes. We investigate PST in both discrete- and continuous-variable input regimes, using single photon state, Schrödinger cat states, and two-mode squeezed vacuum state. Our findings apply to the engineering of quantum networks and photonic lattices, paving the way for applications in controlled routing in integrated quantum circuits.
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