advanced erc grant: quagatua avh senior research grant + feodor lynen hamburg theory prize chist-era...
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Advanced ERC Grant:QUAGATUA
AvHSenior
ResearchGrant
+FeodorLynen
HamburgTheoryPrize
Chist-Era DIQIP
Maciej Lewenstein
Detecting Non-Locality in Many Body
Systems
Enrico Fermi School Course 191
EU IP SIQS
EU STREP EQuaM
Advanced ERC Grant:OSYRIS
John Templeton Foundation
ICFO-Cellex-Severo Ochoa
Polish Science Foundation
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ICFO – Quantum Optics Theory
PhD ICFO: Ulrich Ebling (Fermions) Alejandro Zamora (MPS,LGT) Piotr Migdał (QI, QNetworks) Jordi Tura (QI, many body) Mussie Beian (Excitons, exp) Samuel Mugel (Art. Graphene) Aniello Lampo (Open Systems) David Raventos (Gauge Fields)Caixa-Manresa-Fellows: Julia Stasińska (QI, Disorder)Polish postoc grants Ravindra Chhajlany (Hubbard Models)MPI Garching postdoc: Andy Ferris (TNS, Frustrated AFM)
Postdocs ICFO: Alessio Celi (LGT, Gen. Rel.) Tobias Grass (FQHE, Exact Diag.) Remigiusz Augusiak (QI, Many Body) Pietro Massignan (Fermions, Disorder) G. John Lapeyre (QI, Statphys) Luca Tagliacozzo (LGT, TNS, QDyn) Christine Muschik (TQNP) Alex Streltsov (QI) Arnau Riera (QThermo, QDyn) Pierrick Cheiney (Art. Graphene, exp)
Stagiers (en français) Michał Maik (Dipolar gases) Anna Przysiężna (Dipolar gases)
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Detecting non-locality in many body systems - Outline
2. Non-locality in many body systems•2.1 Correlations – DIQIP approach•2.2 Non-locality in many body systems•2.3 Physical realizations with ultracold ions
1. Entanglement in many body systems•1.1 Computational complexity•1.2 Entanglement of pure states (generic, and not…)•1.3 Area laws•1.4 Tensor network states
Many body physics from a quantum information perspective R. Augusiak, F. M. Cucchietti, M. Lewenstein Lect. Notes Phys. 843, 245-294 (2010).
Ultracold atoms in optical lattices: Simulating quantum many-body systems M. Lewenstein, A. Sanpera, V. Ahufinger Oxford University Press (2012)
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1.1 Computational complexity
Classical simulators:
What can be simulated classically? What is computationally hard (examples)?
Ultracold atoms in optical lattices: Simulating quantum many-body physics, M. Lewenstein, A. Sanpera, V. Ahufinger, in print Oxford University Press (2012)
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1.1 What can be simulated classically?
Quantum Monte Carlo
Systematic perturbation theory
Variational methods (mean field, MPS, PEPS MERA, TNS…)
Exact diagonalization
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1.1 What is computationally hard?
Fermionic models
Frustrated systems
Quantum dynamics
Disordered systems
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1.2 Entanglement of pure states
“Good” entanglement measure for pure states Take reduced density matrix: ρA = TrB(ρAB) = TrB(|ΨAB›‹ΨAB|), and then take von Neumann entropy E(|ΨAB›‹ΨAB|) = S(ρA) = S(ρB), where S(ρ) = -Tr(ρ log ρ). Note that maximally entangled states have E(|ΨAB›‹ΨAB|) = log dANote: For mixed states a super hard
problem…
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1.2 Why computations may be hard? Entanglement of a generic state
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1.2 Why computations may be hard? Entanglement of a generic state
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1.3 Why there are some hopes? - Area laws
Classical area laws
Thermal area laws
Quantum area laws in 2D?
Quantum area laws in 1D
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1.3 Area laws
Area law: Averaged values of correlations, between the regions A and B, scale as the size of the boundary of A. For instance for quantum pure (ground states): S(ρA) ~ ∂A (Jacob Beckenstein, Mark Srednicki…)
A
B
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1.3 Area laws for thermal states
AB
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1.3 Quantum area laws in 1D
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1.3 Quantum area laws in 1D
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1.3 Quantum area laws in 2D, 3D …
?
One can prove generally S(ρA) ≤ |∂A| log(|∂A|)
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1.4 TNS and quantum many-body systems
1... 1| | ,...,Ni i Nc i i
We need coefficients to represent a state.2N
To determine physical quantitites (expectation values) an exponential number of computations is required.
Many-body quantum systems are difficult to describe.
|
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1.4 Definition of TNS (MPS in 1D)
1P 2P 3P 4P 5P 6P
2
1
| |kk nn
P n
maps 2D D
as:
|
D-dimensional
| | | | |
are maximally entangled states 1
| | ,D
m
m m
where
GHZ states:
| 0,0 |1,1 | 0,0 |1,1
P
| GHZ | 0,0,0 |1,1,1
1D states:
| 0 0,0 | |1 1,1|P where maps 2 2 2
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2) Periodic boundary conditions:
It outperforms DMRG
,
k j k j k jx x y y z z
k j
H
1) Open boundary conditions:
It coincides with DMRG
1P 2P 3P 4P 5P 6P
| | | | |
1P 2P 3P 4P 5P 6P
| | | | |
|
(Verstraete, Porras, Cirac, PRL 2004)
1 2
1
1
1 2 1,..., 0
| Tr ... | ,...,N
N
ii iN N
i i
A A A i i
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2D states:
General:
|
|
|
|
,i jP
2
1
| |kk nn
P n
2D D D D
maps
Definition of TNS (MPS in 1D)
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2. Non-locality in Many Body Systems
Courtesy of Ana Belén Sainz
paris.pdf
J. Tura, R. Augusiak, A.B. Sainz, T. Vértesi, M. Lewenstein, and A. Acín, Detecting the non-locality of quantum many body states, arXiv:1306.6860, Science 344, 1256 (2014).
J. Tura, A.B. Sainz, T. Vértesi, A. Acín, M. Lewenstein, R. Augusiak, Translationally invariant Bell inequalities with two-body correlators, arXiv:1312.0265, in print to special issue of J. Phys. A on “50 years of Bell’s Theorem”.
•2.1 Correlations – DIQIP approach•2.2 Non-locality in many body systems
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Analytic example: Family of many body Bell inequalities
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2.3 Physical realizations with ultracold
ions
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2.3 Realizations with ultracold ions/atoms
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2.3 Realizations with ultracold ions
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2.3 Realizations with ultracold ions
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2.3 Realizations with ultracold ions
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2.3 Realizations with ultracold ions
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Detecting non-locality in many body systems - Conclusions
2. Non-locality in many body systems
•“Weak” entanglement ≈ Locality with respect to “simple” Bell inequalities.•“Strong” non-locality and symmetry ≈ Classical computability?
1. Entanglement in many body systems
• “Weak” entanglement ≈ Area laws ≈ Classical computability!
Many body physics from a quantum information perspective R. Augusiak, F. M. Cucchietti, M. Lewenstein Lect. Notes Phys. 843, 245-294 (2010).
Ultracold atoms in optical lattices: Simulating quantum many-body systems M. Lewenstein, A. Sanpera, V. Ahufinger Oxford University Press (2012)
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Quantum Optics Theory ICFO
Hits 2013-2014
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Shakin‘ and artificial gauge fields
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Shakin‘ and artificial gauge fields
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Syntethic gauge fields in syntethic dimensions
For applications to quantum random walks: talk to Sam Mugel
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Detection of topological order
In print in
Phys. R
ev. Lett.
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Quantum simulators of lattice gauge theories
Submitted to
Physical Review X
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Artificial graphene (with Leticia Tarruell)
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Spinor dynamics of high spin Fermi gas
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The world according to Om
Commissioned by Reports on Progress in
Physics
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Toward quantum nanophotonics (with Darrick Chang)
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High harmonic generation and atto-nanophysics
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Condensation of excitons (with François Dubin, experiment)
+ M. Lewenstein
In print in
EPL
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Classical Brownian motion and biophotonics (with Maria García-Parajo)
Submitted to
Nature Physics
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Ultracold atoms in optical lattices: Simulating quantum many-body physicsM. Lewenstein, A. Sanpera, and V. Ahufinger, Oxford University Press (2012)Atomic Physics: Precise measurements & ultracold matterM. Inguscio and L. Fallani, Oxford University Press (2013)
Quantum simulators, precise measurements and ultracold matter