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Realization of the Hofstadter Hamiltonian with ultracold atoms in optical lattices.
It is shown that for two atomic spin states with opposite magnetic moments, the experimental implementation of an optical lattice that allows for the generation of large homogeneous and tunable artificial magnetic fields with ultracold atoms naturally realizes the time-reversal-symmetric Hamiltonian underlying the quantum spin Hall effect.
14-Qubit entanglement: creation and coherence.
We report the creation of Greenberger-Horne-Zeilinger states with up to 14 qubits. By investigating the coherence of up to 8 ions over time, we observe a decay proportional to the square of the
Direct measurement of the Zak phase in topological Bloch bands
Geometric phases that characterize the topological properties of Bloch bands play a fundamental role in the band theory of solids. Here we report on the measurement of the geometric phase acquired by
An open-system quantum simulator with trapped ions
This work combines multi-qubit gates with optical pumping to implement coherent operations and dissipative processes and illustrates the ability to engineer the open-system dynamics through the dissipative preparation of entangled states, the simulation of coherent many-body spin interactions, and the quantum non-demolition measurement of multi- qubit observables.
Measuring the Chern number of Hofstadter bands with ultracold bosonic atoms
Chern numbers characterize the quantum Hall effect conductance—non-zero values are associated with topological phases. Previously only spotted in electronic systems, they have now been measured in
Generation of hyperentangled photon pairs.
It is experimentally demonstrate the first quantum system entangled in every degree of freedom (hyperentangled) and reports the tomography of a 2 x 2 x 3 x 3 system (36-dimensional Hilbert space), which is believed to be the first reported photonic entangled system of this size to be so characterized.
Observation of chiral currents with ultracold atoms in bosonic ladders
Laser-assisted tunnelling allows quantum gases in optical lattices to be exposed to tunable artificial magnetic fields. Using such fields to confine a bosonic gas to an array of one-dimensional
Universal Digital Quantum Simulation with Trapped Ions
The digital approach to quantum simulation in a system of trapped ions is demonstrated and evidence that the level of control required for a full-scale device is within reach is provided.
A quantum information processor with trapped ions
This work presents a small-scale quantum information processor based on a string of 40Ca+ ions confined in a macroscopic linear Paul trap and reviews the set of operations which includes non-coherent operations allowing us to realize arbitrary Markovian processes.
Beating the channel capacity limit for linear photonic superdense coding
Classically, one photon can transport one bit of information. But more is possible when quantum entanglement comes into play, and a record ‘channel capacity’ of 1.63 bits per photon has now been