24 May 2023
Atomic clocks work by using a laser to bounce the electrons in an atom at a given frequency, while nuclear clocks would theoretically do the same for atomic nuclei, and we are a step closer to building one
1 March 2023
A clock that ticks using vibrations of strontium molecules could be used to test Albert Einstein’s theory of relativity or to search for forces that have yet to be described
10 November 2022
Placing a particle of light in a superposition so that it is travelling both forwards and backwards in time could prove useful for quantum computation
24 October 2022
A quantum stopwatch made of lasers and helium atoms can measure the time that has passed with complete accuracy, without counting seconds like other clocks
5 July 2022
Physicists find that causal loops, where two events separated in time influence each other in paradoxical ways, are allowed in many theoretical universes, some of which share features with our own
15 June 2022
From what it is and why it only goes one way to how we perceive its passage and whether we could live without it, a journey exploring the many outstanding questions about time is always worth taking
15 June 2022
The most advanced atomic clocks don’t just tell time – they could soon get so ludicrously accurate that they could be used for detecting gravitational waves and testing the limits of relativity
15 June 2022
The universe might meet its end in a big freeze, a big crunch, or a big rip. But whether time ends with the demise of the cosmos depends on whether it is even real after all
15 June 2022
Physicists have long sought to marry general relativity and quantum mechanics – now some reckon experiments that probe the way each theory treats time could finally make it happen
15 June 2022
The physics thought to explain the arrow of time is not as simple as you might think – and in traversable wormholes, Einstein’s theory of general relativity does in principle offer routes to the past
