\n <\/p>\n
Part of the IBM Quantum System Two computer.<\/span>Credit: Angela Weiss\/AFP via Getty<\/span><\/p>\n Claims of leaps in quantum computing are made almost daily, but progress is hard to judge when each research group uses its own mixture of hardware, algorithms and evaluation metrics, making it near impossible to compare systems. Now, researchers are trying to make it easier to chart the performance of quantum machines.<\/p>\n As part of an ongoing effort, a consortium of UK researchers has created a suite of metrics that they say is a holistic way to measure the performance of quantum computers. They have published the work alongside a library of open-source software called QCMet1. Separately, a group including tech giant IBM and Helsinki-based quantum-software company Algorithmiq launched the Quantum Advantage Tracker last month as a way to compare experiments that purport to show \u2018quantum advantage\u2019 \u2014 that is, an efficiency or accuracy better than that of a classical machine.<\/p>\n \u201cPeople ask, \u2018When is quantum computing going to be useful?\u2019 I think it\u2019s a little bit of a farcical question to answer without some data. And I think having data-driven answers is exactly what initiatives like this are pushing for,\u201d says James Whitfield, a quantum physicist at Dartmouth College in Hanover, New Hampshire.<\/p>\n Classical computers encode information in bits that can be either 1 or 0. Quantum computers are instead based on quantum bits, or \u2018qubits\u2019, using any system \u2014 such as light or tiny superconducting loops \u2014 that can be put into a state of being both 1 and 0 at once. Physicists make qubits interact in ways that they hope will allow them to perform certain kinds of calculation much faster than would otherwise be possible. Some groups have created quantum computers that contain more than 1,000 qubits. But maintaining ever-larger systems while operating the computer is challenging.<\/p>\n Quantum computers: what are they good for?<\/p>\n<\/p>\n When publicizing their results, quantum-computing companies often highlight the number of qubits in their machine as an indication of how advanced it is. But this doesn\u2019t tell the full story: other metrics are often more relevant, such as error rates and how many qubits can be connected or harnessed in each calculation. And it is not always clear how firms calculate the figures they report. The QCMet project \u2014 led by researchers at the National Physical Laboratory (NPL) in Teddington, UK \u2014 has built a list of metrics and algorithms to capture the performance and capabilities of all kinds of quantum computer, as well as publishing software to help standardize how each measurement is performed.<\/p>\n \u201cYou shouldn\u2019t just use one [metric] to tell you which is \u2018better\u2019 \u2014 you need to have the larger picture,\u201d says Abhishek Agarwal, a quantum physicist at the NPL, who is part of the project. One often-ignored factor is stability, he says. In some systems, \u201cif you run something now, versus even two minutes later, you can get quite different results\u201d.<\/p>\n Using a range of metrics could help to harmonize what types of result researchers report, improving comparisons between quantum computers, as well as interoperability, says Whitfield. Each type of qubit has its own strengths, and sometimes companies report only the metrics that suit them. \u201cIt\u2019s almost like they don\u2019t want you to compare across devices,\u201d Whitfield says.<\/p>\n The Quantum Advantage Tracker aims to help compare quantum machines by gauging how well quantum computers perform at particular applications, compared with classical computers. Claims of quantum advantage \u2014 often for little-known and very specific applications \u2014 are usually quickly overturned once external researchers improve the performance of classical methods. The tracker could help to monitor these ever-moving goalposts, says Whitfield.<\/p>\n","protected":false},"excerpt":{"rendered":" Part of the IBM Quantum System Two computer.Credit: Angela Weiss\/AFP via Getty Claims of leaps in quantum computing are made almost daily, but progress is hard to judge when each research group uses its own mixture of hardware, algorithms and evaluation metrics, making it near impossible to compare systems. Now, researchers are trying to make<\/p>\n","protected":false},"author":1,"featured_media":36937,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[58],"tags":[5694,1891,1663,20528,20527,4361,20529,1933],"class_list":{"0":"post-36936","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-science","8":"tag-breakthroughs","9":"tag-claims","10":"tag-computing","11":"tag-distinguish","12":"tag-kpis","13":"tag-quantum","14":"tag-spurious","15":"tag-true"},"_links":{"self":[{"href":"https:\/\/naijaglobalnews.org\/index.php?rest_route=\/wp\/v2\/posts\/36936","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/naijaglobalnews.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/naijaglobalnews.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/naijaglobalnews.org\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/naijaglobalnews.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=36936"}],"version-history":[{"count":0,"href":"https:\/\/naijaglobalnews.org\/index.php?rest_route=\/wp\/v2\/posts\/36936\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/naijaglobalnews.org\/index.php?rest_route=\/wp\/v2\/media\/36937"}],"wp:attachment":[{"href":"https:\/\/naijaglobalnews.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=36936"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/naijaglobalnews.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=36936"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/naijaglobalnews.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=36936"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}Many possible metrics<\/h2>\n
Scrutinizing quantum advantage<\/h2>\n