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Was Albert Einstein einst „spukhafte Fernwirkung“ nannte, war der Royal Swedish Academy of Sciences den Physiknobelpreis 2022 wert. Durch die Kombination von zeitlichem Multiplexing und kontrollierten Feed‐forward‐Signalen in einem photonischen Quantenspeicher gelingt die Verschränkung sogenannter Greenberger‐Horn‐Zeilinger‐Zustände von immer mehr Quantenteilchen nun schneller und effizienter.
We present the protocol for Gaussian Boson Sampling with single-mode squeezed states. We eliminate heralding and show that our proposal with the Hafnian matrix function can retain the higher photon number contributions at the input.
The measurement process plays a crucial role in quantum mechanics as it interrupts the unitary evolution of a state. The consequences are apparent when investigating the return probability (Polya-number) of a particle in a Hadamard walk on the line [1, 2]: Depending on whether the evolution is restarted or continued after the measurement, either a transient or a recurrent evolution can be observed...
We implement a quantum walk on a percolation graph leveraging a time-multiplexed quantum walk architecture to create broken links between the graph nodes. We test our system by verifying non-Markovian signatures resulting from induced open system dynamics.
We present a time-multiplexed quantum walk in a fibre loop setup and introduce a fast switching electro optic modulator. Hence we can limit the spread of the wavefunction by choice and study the evolution of non-localized initial states.
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