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Tuesday, August 9, 2016

Software Programmable Quantum Computer

Researchers Debut Programmable Quantum Computer

The first of its kind, it’s a major step into the future of computing.

David Z Morris | August 7, 2016

In an August 4th paper in Nature, a team of researchers from the University of Maryland say they have developed a software-programmable quantum computer. UMD’s Joint Quantum Institute describes it as the first re-programmable quantum computer ever, and a major advance over previous demonstrations of quantum computing, which have generally been static devices designed to run only one type of operation.

“Very simply…normal computers work, either there’s power going through a wire or not—a one, or a zero. They’re binary systems,” said Trudeau, triggering a wave of surprised applause.
“What quantum states allow for is much more complex information to be encoded into a single bit…a quantum state can be much more complex than that, because as we know, things can be both particle and wave at the same time.”
Canadian Prime Minister Justin Trudeau explaining quantum computers. Source:

[Click to Enlarge] ("a, Hierarchy of operations from software to hardware. See main text for details. b, Hardware setup. A linear chain of trapped ion qubits along the Z axis is shown at the centre of the panel (‘Ion chain’). An imaging objective (‘Detection optics’) collects ion fluorescence along the Y axis and maps each ion onto a multichannel photo-multiplier tube (PMT) for measurement of individual qubits. Counterpropagating Raman beams (‘Global’ and ‘Individual’) along the X axis perform qubit operations. A diffractive beam splitter creates an array of static Raman beams that are individually switched using a multi-channel acousto-optic modulator (AOM) driven by radio frequency (‘Control radio-frequency signals’) to perform qubit-selective gates. By modulating appropriate addressing beams, any single-qubit rotation or two-qubit Ising (XX) gate can be realized. For the two-qubit gates between qubits i and j, we can continuously tune the nonlinear gate angle χij. This represents a system of qubits with fully connected and reconfigurable spin–spin Ising interactions (inset).") Source:

<more at; related articles and links: (Programmable ions set the stage for general-purpose quantum computers. A new quantum computer module combines proven techniques with advances in hardware and software. August 3, 2016) and (Demonstration of a small programmable quantum computer with atomic qubits. S. Debnath, N. M. Linke, C. Figgatt, K. A. Landsman, K. Wright and C. Monroe. Nature 536, 63–66 (04 August 2016) doi:10.1038/nature18648. [Summary: Quantum computers can solve certain problems more efficiently than any possible conventional computer. Small quantum algorithms have been demonstrated on multiple quantum computing platforms, many specifically tailored in hardware to implement a particular algorithm or execute a limited number of computational paths. Here we demonstrate a five-qubit trapped-ion quantum computer that can be programmed in software to implement arbitrary quantum algorithms by executing any sequence of universal quantum logic gates. We compile algorithms into a fully connected set of gate operations that are native to the hardware and have a mean fidelity of 98 per cent. Reconfiguring these gate sequences provides the flexibility to implement a variety of algorithms without altering the hardware. As examples, we implement the Deutsch–Jozsa and Bernstein–Vazirani algorithms with average success rates of 95 and 90 per cent, respectively. We also perform a coherent quantum Fourier transform on five trapped-ion qubits for phase estimation and period finding with average fidelities of 62 and 84 per cent, respectively. This small quantum computer can be scaled to larger numbers of qubits within a single register, and can be further expanded by connecting several such modules through ion shuttling or photonic quantum channels.])>

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