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Probing many-body dynamics on a 51-atom quantum simulator
This work demonstrates a method for creating controlled many-body quantum matter that combines deterministically prepared, reconfigurable arrays of individually trapped cold atoms with strong, coherent interactions enabled by excitation to Rydberg states, and realizes a programmable Ising-type quantum spin model with tunable interactions and system sizes of up to 51 qubits.
Quantum convolutional neural networks
A quantum circuit-based algorithm inspired by convolutional neural networks is shown to successfully perform quantum phase recognition and devise quantum error correcting codes when applied to arbitrary input quantum states.
Quantum Approximate Optimization Algorithm: Performance, Mechanism, and Implementation on Near-Term Devices
- Leo Zhou, Sheng-Tao Wang, Soonwon Choi, H. Pichler, M. Lukin
- Computer Science, Physics
- 1 December 2018
An in-depth study of the performance of QAOA on MaxCut problems is provided by developing an efficient parameter-optimization procedure and revealing its ability to exploit non-adiabatic operations, illustrating that optimization will be important only for problem sizes beyond numerical simulations, but accessible on near-term devices.
Theory of the phase transition in random unitary circuits with measurements
We present a theory of the entanglement transition tuned by measurement strength in qudit chains evolved by random unitary circuits and subject to either weak or random projective measurements. The…
Probing entanglement in a many-body–localized system
This work experimentally establishes many-body localization as a qualitatively distinct phenomenon from localization in noninteracting, disordered systems in a disordered Bose-Hubbard chain.
Depolarization Dynamics in a Strongly Interacting Solid-State Spin Ensemble.
The depolarization dynamics of a dense ensemble of dipolar interacting spins, associated with nitrogen-vacancy centers in diamond, is studied to propose a microscopic model where an interplay of long-range interactions, disorder, and dissipation leads to predictions in quantitative agreement with both current and prior experimental results.
Emergent SU(2) Dynamics and Perfect Quantum Many-Body Scars.
A weak quasilocal deformation of the Rydberg-blockaded Hamiltonian is constructed, which makes the revivals virtually perfect and suggests the existence of an underlying nonintegrable Hamiltonian which supports an emergent SU(2)-spin dynamics within a small subspace of the many-body Hilbert space.
Symmetry enriched phases of quantum circuits
Periodic Orbits, Entanglement, and Quantum Many-Body Scars in Constrained Models: Matrix Product State Approach.
A manifold of locally entangled spin states is introduced, representable by low-bond dimension matrix product states, and it is found that they feature isolated, unstable periodic orbits, which capture the recurrences and represent nonergodic dynamical trajectories.
Robust Dynamic Hamiltonian Engineering of Many-Body Spin Systems
A new framework for the robust control of quantum dynamics of strongly interacting many-body systems by utilizing a matrix representation of the Hamiltonian engineering protocol based on time-domain transformations of the Pauli spin operator along the quantization axis to engineer robust target Hamiltonians.