Photonic simulation of entanglement growth and engineering after a spin chain quench

Ioannis Pitsios, Leonardo Banchi, Adil S. Rab, Marco Bentivegna, Debora Caprara, Andrea Crespi, Nicolò Spagnolo, Sougato Bose (), Paolo Mataloni, Roberto Osellame () and Fabio Sciarrino ()
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Ioannis Pitsios: Istituto di Fotonica e Nanotecnologie—Consiglio Nazionale delle Ricerche (IFN-CNR), P.za Leonardo da Vinci
Leonardo Banchi: University College London
Adil S. Rab: Università di Roma
Marco Bentivegna: Università di Roma
Debora Caprara: Università di Roma
Andrea Crespi: Istituto di Fotonica e Nanotecnologie—Consiglio Nazionale delle Ricerche (IFN-CNR), P.za Leonardo da Vinci
Nicolò Spagnolo: Università di Roma
Sougato Bose: University College London
Paolo Mataloni: Università di Roma
Roberto Osellame: Istituto di Fotonica e Nanotecnologie—Consiglio Nazionale delle Ricerche (IFN-CNR), P.za Leonardo da Vinci
Fabio Sciarrino: Università di Roma

Nature Communications, 2017, vol. 8, issue 1, 1-8

Abstract: Abstract The time evolution of quantum many-body systems is one of the most important processes for benchmarking quantum simulators. The most curious feature of such dynamics is the growth of quantum entanglement to an amount proportional to the system size (volume law) even when interactions are local. This phenomenon has great ramifications for fundamental aspects, while its optimisation clearly has an impact on technology (e.g., for on-chip quantum networking). Here we use an integrated photonic chip with a circuit-based approach to simulate the dynamics of a spin chain and maximise the entanglement generation. The resulting entanglement is certified by constructing a second chip, which measures the entanglement between multiple distant pairs of simulated spins, as well as the block entanglement entropy. This is the first photonic simulation and optimisation of the extensive growth of entanglement in a spin chain, and opens up the use of photonic circuits for optimising quantum devices.

Date: 2017
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DOI: 10.1038/s41467-017-01589-y

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