Here is IBM’s quantum roadmap from 2019 through 2026+ showing hardware implementations, toolkit and algorithm development and deployment, and support services for developers.
You can run quantum computing algorithms on physical quantum hardware via the IBM Cloud today. Program execution on the 27-qubit Falcon R5 processors is billed at US$ 1.60 per runtime second under the Pay-As-You-Go Plan.
I wonder how long until it is reduced in watch size? Sold packaged with representative entangled watch band and and t-shirt?
As things stand, quantum computing is likely to remain a service one accesses via a cloud provider for a long time. Due to the need to prevent qubits from decohering, quantum computer hardware needs to operate at deeply unnatural temperatures, such as millikelvins above absolute zero. By “deeply unnatural”, I mean that this is far below the coldest temperature in the natural universe, which is the 2.7° K cosmic background radiation that permeates space. To reach the temperatures where quantum computing can work requires refrigeration hardware, isolation to allow signals to pass in and out without heating the computing elements, and all of the complexity, size, and weight that implies. Here is an IBM video that gives a sense of the size of their Osprey 433-qubit system.
Here is a glimpse of the complexity inside: