When the number variance drops below 1 atom on each site, the system undergoes an insulating phase transition to a state characterized by a fixed number of atoms per lattice site (for commensurate fillings and translationally invariant lattices). “ Experimental Comparison of Two Quantum Computing Architectures,” N. By analogy with quantum optical systems, the many-body state at each site becomes number-squeezed.This first comparison of algorithms on different platforms shows the power of having a programmable and reconfigurable system, which will be critical to successfully adapt to new quantum algorithms as they are discovered. The performance is seen to mirror the connectivity of the systems, with the ion trap system out-performing the superconducting system on all results, but particularly when the algorithm demands more connections.
#Cold atom quantum coherence pdf
A 92, 043828 Published 20 October 2015 More PDF HTML Export Citation Abstract We consider an all-optical photon switch in an atomic gas which is gated via a so-called Rydberg spin wave, i.e., a single Rydberg excitation that is coherently shared by the whole ensemble. In particular, paired photons with a Biphotons with narrow bandwidth and long coherence time can enhance light-atom interaction, which leads to strong coupling between photonic and atomic qubits. We run several quantum algorithms on two 5-qubit programmable quantum computers: our fully-connected ion trap system, and the IBM Quantum Experience superconducting system. Coherence in a cold-atom photon switch Weibin Li and Igor Lesanovsky Phys. Such strong coupling is desirable in quantum information processing, quantum storage and communication. Connectivity between qubits in a quantum computer may be as important as clock speed and gate fidelity when it comes time to build large-scale quantum computers.
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