Displaying items by tag: Quantum hardware

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In this paper, Wang et al. present experimental results showing genuine multipartite entanglement of up to 16 qubits on the ibmqx5 device, a 16 transmon-qubit universal quantum computing device developed by IBM. Prior to these results entanglement had been reported up to 10 superconducting qubits.

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Coupling between superconducting qubits is typically controlled not by changing the qubit-qubit coupling constant, but by suppressing the coupling by detuning their transition frequency. This approach becomes much more difficult with a high number of qubits, due to the ever-more crowded transition-frequency spectrum. In this paper, Casparis et al. demonstrate an alternative coupling scheme, in the form of a voltage controlled quantum-bus with the ability to change the effective qubit-qubit coupling by a factor of 8 between the on- and off-states without causing significant qubit decoherence.

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Atomic ions can be trapped by electric fields in ultra-high vacuum and then laser-cooled to extremely low temperatures. The internal states of such a trapped ion can be used to encode a qubit. Such qubit systems have very long coherence times and their internal states can be precisely manipulated using lasers, and measured efficiently. Current, room temperature, systems are limited to 50 ions to to collisions with background gas. At cryogenic temperatures (4K) , most of the residual background gas is trapped enabling further scale-up of ion-trap systems. In this paper, Pagano et al. present experimental results from a trapped ion system with such cryogenic-pumping, which enables them to trap over 100 ions in a linear configuration for hours, paving the way for future quantum simulation of spin models that are intractable with classical computer modelling.

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Realization of a universal set of quantum gates is a crucial milestone in the development of any qubit-technology aiming to become a platform for large scale quantum computing. In this paper, Gutiérrez et al. assess the capability of current trapped-ion architectures in the implementation of an entangling CNOT gate between encoded logical qubits.

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In this paper Flamini et al. provide a comprehensive overview of the current (March 2018) state of the art in the field of photonic quantum information processing including quantum communication and photonic quantum simulation.

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Multi-qubit entanglement is a critical prerequisite for quantum supremacy (quantum computers offering tractability or speed-up compared to classical computing). So far, verified multipartite entanglement has been reported in qubit platforms up to 14 trapped ions, 10 photons and 10 superconducting qubits. In this paper, Wang et al. experimentally demonstrate an 18-qubit maximal (GHZ) entanglement by simultaneous exploiting three different degrees-of-freedom of six photons, including their paths, polarization, and orbital angular momentum.

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Boson sampling is a rudimentary quantum algorithm tailored to the platform of photons in linear optics. Prior to this paper by Neville et al, it was believed that Boson-sampling was a good candidate to be the first to experimentally show quantum supremacy. However, Neville et al. show that this would require a technological step change, reaching photon numbers of over 50 and ultra-low loss interferometers with thousands of modes. It is therefore highly unlikely that Boson-sampling experiments will win the 'quantum supremacy race' currently believed to be led by semiconductor-qubit platforms.

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