US President Donald Trump (3L) speaks, flanked by US Senator Ted Cruz (R-TX)(2L), US Secretary of Commerce Howard Lutnick (3R) and Chair of the President's Council of Advisors on Science and Technology David Sachs (R), during a signing ceremony on AI the Oval Office of the White House in Washington, DC, on December 11, 2025. (Photo by Alex WROBLEWSKI / AFP via Getty Images)

A quantum metrology research engineer operates an Absolute Quantum Gravimeter, a mobile instrument which acts as a national reference for the measure of gravity, during the presentation of the MetriQs-France platform which provides reliable measurements for quantum technology, in Trappes southwest of Paris on December 11, 2025. (Photo by Anne-Christine POUJOULAT / AFP via Getty Images)

Quantum metrology research engineer Matthieu Thomas presents the Kibble balance, an electromechanical measuring instrument used to determine the definition of the kilogram unit of mass, during the presentation of the MetriQs-France platform which provides reliable measurements for quantum technology, in Trappes southwest of Paris on December 11, 2025. (Photo by Anne-Christine POUJOULAT / AFP via Getty Images)

Quantum metrology research engineer Francois Couedo presents measurement instruments, a quantum calculator from the laboratory of characterisation of solid-state Qubit and enabling technologies, during the presentation of the MetriQs-France platform which provides reliable measurements for quantum technology, in Trappes southwest of Paris on December 11, 2025. (Photo by Anne-Christine POUJOULAT / AFP via Getty Images)

Quantum metrology research engineer Matthieu Thomas presents the Kibble balance, an electromechanical measuring instrument used to determine the definition of the kilogram unit of mass, during the presentation of the MetriQs-France platform which provides reliable measurements for quantum technology, in Trappes southwest of Paris on December 11, 2025. (Photo by Anne-Christine POUJOULAT / AFP via Getty Images)

A quantum metrology research engineer operates an Absolute Quantum Gravimeter, a mobile instrument which acts as a national reference for the measure of gravity, during the presentation of the MetriQs-France platform which provides reliable measurements for quantum technology, in Trappes southwest of Paris on December 11, 2025. (Photo by Anne-Christine POUJOULAT / AFP via Getty Images)

Quantum metrology research engineer Francois Couedo presents measurement instruments, a quantum calculator from the laboratory of characterisation of solid-state Qubit and enabling technologies, during the presentation of the MetriQs-France platform which provides reliable measurements for quantum technology, in Trappes southwest of Paris on December 11, 2025. (Photo by Anne-Christine POUJOULAT / AFP via Getty Images)

Quantum metrology research engineer Matthieu Thomas presents the Kibble balance, an electromechanical measuring instrument used to determine the definition of the kilogram unit of mass, during the presentation of the MetriQs-France platform which provides reliable measurements for quantum technology, in Trappes southwest of Paris on December 11, 2025. (Photo by Anne-Christine POUJOULAT / AFP via Getty Images)