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Measurement-based dynamic control of mesoscopic many-body systems

Descrizione del progetto

Rivoluzionare il controllo quantistico

Il controllo quantistico è una struttura ambiziosa per guidare le dinamiche da stati iniziali a stati finali arbitrari e desiderati. Tuttavia, la maggior parte degli schemi generici di controllo quantistico sono stati finora limitati da pesanti requisiti di controllabilità dell’hamiltoniana di un sistema o di un insieme di operatori di misura, il che ne rende difficile l’attuazione efficiente in molti scenari realistici. Il progetto MECTRL, finanziato dal CER, intende superare queste limitazioni e rendere più efficiente e affidabile il controllo quantistico a molti corpi. Il progetto utilizzerà una combinazione di evoluzione temporale a molti corpi fissa e una conoscenza precisa della retroazione quantistica per progettare la dinamica in sistemi a molti corpi sufficientemente piccoli ma interessanti. Si cercherà di costruire algoritmi informatici di ottimizzazione di nuova generazione con un livello di cognizione superiore.

Obiettivo

Quantum control is an ambitious framework for steering dynamics from initial states to arbitrary desired final states. It has over the past decade been used extensively with immense success for control of low- dimensional systems in as varied fields as molecular dynamics and quantum computation. Only recently have efforts been initiated to extend this to higher-dimensional many-body systems. Most generic quantum control schemes to date, however, put quite heavy requirements on the controllability of either the system Hamiltonian or a set of measurement operators. This will in many realistic scenarios prohibit an efficient realization.

Within this proposal, I will develop a new quantum control scheme, which is minimalistic on system requirements and therefore ideally suited for the efficient and reliable optimization of many-body control problems. The fundamentally new ingredient is the total quantum evolution dictated by a combination of fixed many-body time evolution and the precise knowledge of the quantum back-action due to repeated quantum non-destruction (QND) measurements of a single projection operator.
The main focus of this proposal is theoretical and experimental quantum engineering of the dynamics in systems, which are sufficiently small to calculate the measurement back-action exactly and sufficiently large to have interesting many-body properties.
Recent experimental advances in single site manipulation of bosons in optical lattices have enabled the high fidelity preparation exactly such mesoscopic samples of atoms (5-50). This forms an ideal starting point for many-body quantum control, and we will i.a. demonstrate engineering of quantum phase transitions and preparation of highly non-classical Schödinger cat states.

Finally, using the results from an online graphical interface allowing users of the internet to solve quantum problems we will attempt to build next-generation optimization computer algorithms with a higher level of cognition built in.

Meccanismo di finanziamento

ERC-STG - Starting Grant

Coordinatore

AARHUS UNIVERSITET
Contribution nette de l'UE
€ 1 499 406,00
Indirizzo
Nordre ringgade 1
8000 Aarhus c
Danimarca

Mostra sulla mappa

Regione
Danmark Midtjylland Østjylland
Tipo di attività
Higher or Secondary Education Establishments
Collegamenti
Costo totale
€ 1 499 406,00

Beneficiari (1)