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Articles by Simon Benjamin
Artificial intelligence for quantum computing
7 hours ago This as-told-to essay is based on a conversation with Maitri Mangal, a 26-year-old software engineer at Google, based in New York. Her identity and employment have been verified by Business Insider. The following has been edited for length and clarity. When I started off as a software engineer, my …
Shuttling arrives for silicon quantum computers - Nature Nanotechnology
Near-perfect shuttling of silicon spin qubits is demonstrated, closing a gap versus rival systems.
Quantum error mitigation
For quantum computers to successfully solve real-world problems, it is necessary to tackle the challenge of noise: the errors that occur in elementary physical components due to unwanted or imperfect interactions. The theory of quantum fault tolerance can provide an answer in the long term, but in the coming era of noisy intermediate-scale quantum machines one must seek to mitigate errors rather than completely eliminate them.
Quantum Computing is Scalable on a Planar Array of Qubits with Fabrication Defects
Abstract To successfully execute large-scale algorithms, a quantum computer will need to perform its elementary operations near perfectly. This is a fundamental challenge since all physical qubits suffer a considerable level of noise. Moreover, real systems are likely to have a finite yield, i.e., some nonzero proportion of the components in a complex device may be irredeemably broken at the fabrication stage.
Looped Pipelines Enabling Effective 3D Qubit Lattices in a Strictly 2D Device
Abstract Many quantum computing platforms are based on a two-dimensional (2D) physical layout. Here we explore a concept called looped pipelines, which permits one to obtain many of the advantages of a three-dimensional (3D) lattice while operating a strictly 2D device. The concept leverages qubit shuttling, a well-established feature in platforms like semiconductor spin qubits and trapped-ion qubits.
Multicore Quantum Computing
Abstract Any architecture for practical quantum computing must be scalable. An attractive approach is to create multiple cores, computing regions of fixed size that are well spaced but interlinked with communication channels. This exploded architecture can relax the demands associated with a single monolithic device: the complexity of control, cooling and power infrastructure, as well as the difficulties of crosstalk suppression and near-perfect component yield.
Separating Quantum Hype From Quantum Reality
IQM Quantum Computer (Graphic: Business Wire)
Separating quantum hype from quantum reality
Simon Benjamin is the co-founder of Quantum Motion and professor of quantum technologies at Oxford.
Quantum analytic descent
Abstract Variational algorithms have particular relevance for near-term quantum computers but require nontrivial parameter optimizations. Here we propose analytic descent: Given that the energy landscape must have a certain simple form in the local region around any reference point, it can be efficiently approximated in its entirety by a classical model—we support these observations with rigorous, complexity-theoretic arguments.
Mitigating coherent noise using Pauli conjugation
Abstract Coherent noise can be much more damaging than incoherent (probabilistic) noise in the context of quantum error correction. One solution is to use twirling to turn coherent noise into incoherent Pauli channels. In this Article, we show that some of the coherence of the noise channel can actually be used to improve its logical fidelity by simply sandwiching the noise with a chosen pair of Pauli gates, which we call Pauli conjugation.
Variational ansatz-based quantum simulation of imaginary time evolution
Abstract Imaginary time evolution is a powerful tool for studying quantum systems. While it is possible to simulate with a classical computer, the time and memory requirements generally scale exponentially with the system size. Conversely, quantum computers can efficiently simulate quantum systems, but not non-unitary imaginary time evolution. We propose a variational algorithm for simulating imaginary time evolution on a hybrid quantum computer.
Digital quantum simulation of molecular vibrations
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Barn on the Farm news: Right, here we go!! Tickets for Barn on the Farm Festival 2019 are back ON SALE…
That ‘nicest guy in music’ thing gets used all too often – but for Nick Parker it’s absolutely the right phrase. Not only that – […]
One-dimensional quantum computing with a ‘segmented chain’ is feasible with today’s gate fidelities
Our protocol for quantum error correction is based on the surface code,26 with an optional additional level of encoding if the surface code alone proves insufficient. Using the interaction structure in the segmented chain qubit array, the surface code can be efficiently implemented, but its code distance is limited by the number of qubits in each segment.
Healthy Diet Helps 183-Year-Old Tortoise Feel Young Again
"What a drag it is getting old," the Rolling Stones famously sang. And nobody knows that more than Jonathan, the 183-year-old Aldabra giant tortoise that's thought to be the oldest known living animal on Earth. Old age has caught up with Jonathan, robbing him of his senses of sight and smell and, until a few years ago, relegating him to an unhealthy diet of twigs on the British island territory of St. Helena (map), off Africa's western coast.
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