Armando Perez-Leija

Anderson localization in optical waveguide arrays with off-diagonal coupling disorder

We observe the transition from extended to Anderson-localized states in silica waveguide arrays exhibiting off-diagonal coupling disorder.

Coherent quantum transport in photonic lattices

Transferring quantum states efficiently between distant nodes of an information processing circuit is of paramount importance for scalable quantum computing. We report on an observation of a perfect state transfer protocol on a lattice, thereby demonstrating the general concept of transporting arbitrary quantum information with high fidelity. Coherent transfer over 19 sites is realized by utilizing judiciously designed optical structures consisting of evanescently coupled waveguide elements. We provide unequivocal evidence that such an approach is applicable in the quantum regime, for both bosons and fermions, as well as in the classical limit. Our results illustrate the potential of the perfect state transfer protocol as a promising route towards integrated quantum computing on a chip.

Tailoring the correlation and anticorrelation behavior of path-entangled photons in Glauber-Fock oscillator lattices

We demonstrate that single-photon as well as biphoton revivals are possible in a new class of dynamic optical systems-the so-called Glauber-Fock oscillator lattices. In these arrays, both Bloch-like oscillations and dynamic delocalization can occur which can be described in closed form. The bunching and anti-bunching response of path-entangled photons can be pre-engineered in such coupled optical arrangements and the possibility of emulating Fermionic behavior in this family of lattices is also considered. We elucidate these effects via pertinent examples and we discuss the prospect of experimentally observing these quantum interactions.

Observation of Bloch-like revivals in semi-infinite Glauber-Fock photonic lattices

We report the first experimental implementation of Glauber-Fock oscillator lattices. Bloch-like revivals are observed in these optical structures in spite of the fact that the photonic array is effectively semi-infinite and the waveguide coupling is not uniform. This behavior is entirely analogous to the dynamics exhibited by a driven quantum harmonic oscillator. Our observations are in excellent agreement to the analytical results obtained in this fully integrable lattice system.

Implementation of quantum discrete fractional Fourier transform

In this work we experimentally demonstrate the realization of the discrete fractional Fourier transforms (DFrFT) in both the classical and quantum realm. Our approach is fully integrated and free of bulk optical components.

Measurement of the Aharonov-Anandan phase in photonic lattices

The Aharonov-Anandan phase is a generalization of the Berry phase and so far its observation in photonics has been elusive. Here work we report on measurements of Aharonov-Anandan phases using driven harmonic oscillator photonic lattices.

Two-photon discrete speckle in Anderson-disordered lattices

Two photons in an entangled, spatially correlated (anti-correlated) state transmitted through an Anderson disordered lattice maintain their correlation (anti-correlation) but exhibit coincidence-map speckle in the Fourier plane.

Evolution dynamics of vectorial Bessel beams

We investigate the acceleration dynamics of non-paraxial Bessel beams. We show that this acceleration behavior can persist even in the presence of evanescent components. Our study can be useful in plasmonic and other sub-wavelength settings.

Transition from Anderson co-Localization to anti-co-Localization of Entangled Photon Pairs in Disordered Photonic Waveguide Arrays

We experimentally and theoretically investigate the evolution of different types of two photon entangled states in disordered photonic waveguide arrays. We present a transition from Anderson co-localization to Anderson anti-co-localization.

Observation of Bloch-like oscillations in Glauber-Fock oscillator lattices

We report the first observation of classical Bloch-like oscillations and revivals of light in a new class of dynamic optical systems-the so-called Glauber-Fock oscillator lattices.