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Long-distance quantum communication with atomic ensembles and linear optics
It is shown that the communication efficiency scales polynomially with the channel length, and hence the scheme should be operable over very long distances. Expand
Coherent Manipulation of Coupled Electron Spins in Semiconductor Quantum Dots
We demonstrated coherent control of a quantum two-level system based on two-electron spin states in a double quantum dot, allowing state preparation, coherent manipulation, and projective readout.Expand
High-sensitivity diamond magnetometer with nanoscale resolution
Impurity centres in diamond have recently attracted attention in the context of quantum information processing. Now their use as magnetic-field sensors is explored, promising a fresh approach toExpand
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. Expand
Dipole blockade and quantum information processing in mesoscopic atomic ensembles.
A technique for manipulating quantum information stored in collective states of mesoscopic ensembles by optical excitation into states with strong dipole-dipole interactions that can be employed for controlled generation of collective atomic spin states as well as nonclassical photonic states and for scalable quantum logic gates is described. Expand
Generation of single optical plasmons in metallic nanowires coupled to quantum dots
This work demonstrates a cavity-free, broadband approach for engineering photon–emitter interactions via subwavelength confinement of optical fields near metallic nanostructures and shows that efficient coupling is accompanied by more than 2.5-fold enhancement of the quantum dot spontaneous emission, in good agreement with theoretical predictions. Expand
Nanoscale magnetic sensing with an individual electronic spin in diamond
An approach to nanoscale magnetic sensing is experimentally demonstrated, using coherent manipulation of an individual electronic spin qubit associated with a nitrogen-vacancy impurity in diamond at room temperature to achieve detection of 3 nT magnetic fields at kilohertz frequencies after 100 s of averaging. Expand
Quantum Approximate Optimization Algorithm: Performance, Mechanism, and Implementation on Near-Term Devices.
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. Expand
Quantum memory for photons: Dark-state polaritons
An ideal and reversible transfer technique for the quantum state between light and metastable collective states of matter is presented and analyzed in detail. The method is based on the control ofExpand
A single-photon transistor using nanoscale surface plasmons
Photons rarely interact—which makes it challenging to build all-optical devices in which one light signal controls another. Even in nonlinear optical media, in which two beams can interact because ofExpand