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We formulate a method of quantum tomography that scales linearly with the number of photons and involves only one optical transformation. We demonstrate it experimentally for two-photon entangled states using a special photonic chip.
Full characterization of quantum states is increasingly important as ever more complex quantum systems are realized. Quantum state tomography of these systems is a difficult task because individual measurements only give partial information about the underlying density matrix of the system. Thus, conventionally the measurement apparatus must be reconfigured to take multiple measurements in order to...
Evanescent coupled waveguides could be used to build multipartite inferometeros, which create an optical quantum state generator. The characterization of these integrated photonic devices needs a large effort and experimental expertise. We develop a method to reduce the measurement steps rapidly by using classical laser light. We show the application of this technique on a laser written W-state generator...
We report on our latest findings on photonic Quantum Walks (QW) of entangled particles in several quantum transport regimes as for instance in photonic Bloch lattices or disordered lattices. Furthermore, the discrete fractional Fourier transform of quantum states is presented in the context of QWs.
In this work we demonstrate, theoretically and experimentally, that two-photon probability amplitudes describing propagation of light in any two-photon state are governed by an evolution equation identical to a 2D tight-binding equation.
We present a novel method to generate arbitrary path-encoded EPR-states on-chip by a single operation only. Such states can be utilized to mimic the quantum statistics of fermions, bosons, and anyons.
In this work we experimentally demonstrate a fully integrated photon-counting device based on a divide-and-conquer technique using linear optics in combination with on-off detectors. Our scheme is based on click-counting statistics instead of photon-counting statistics.
We report on the first experimental observation of Bloch Oscillations of nonlocal quantum states. Our integrated photonic circuit could serve as a platform for quantum simulation of the dynamics of bosonic, anyonic and fermionic particles.
Multipartite entangled states like the W-class are of growing interest since they exhibit a variety of possible applications ranging from quantum computation to genuine random number generation. Here, we present a universal setup to generate high-order single photon W-states based on three-dimensional integrated-photonic waveguide structures. Additionally, we present a novel method to characterize...
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.
We present arbitrary wave plate operations on-chip based on the reorientation of the waveguide's optical axis caused by additional stress fields. A successful implementation of Hadamard and Pauli-X gates for quantum light is shown.
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