Quantum logic clock
A quantum clock is a type of
Both the aluminum-based quantum clock and the mercury-based optical atomic clock track time by the ion vibration at an optical frequency using a UV laser, that is 100,000 times higher than the microwave frequencies used in NIST-F1 and other similar time standards around the world. Quantum clocks like this are able to be far more precise than microwave standards.
Accuracy
The NIST team are not able to measure clock ticks per second because the definition of a second is based on the standard NIST-F1, which cannot measure a machine more precise than itself. However, the aluminum ion clock's measured frequency to the current standard is 1121015393207857.4(7) Hz.[2] NIST have attributed the clock's accuracy to the fact that it is insensitive to background magnetic and electric fields, and unaffected by temperature.[3]
In March 2008, physicists at
In February 2010, NIST physicists described a second, enhanced version of the quantum logic clock based on individual ions of magnesium and aluminium. Considered the world's most precise clock in 2010 with a fractional frequency inaccuracy of 8.6 × 10−18, it offers more than twice the precision of the original.[5] [6] In terms of
Quantum time dilation
In a 2020 paper scientists illustrated that and how quantum clocks could experience a possibly experimentally testable superposition of proper times via time dilation of the theory of relativity by which time passes slower for one object in relation to another object when the former moves at a higher velocity. In "quantum time dilation" one of the two clocks moves in a superposition of two localized momentum wave packets,[further explanation needed] resulting in a change to the classical time dilation.[13][14][12]
Other accurate experimental clocks
The accuracy of quantum-logic clocks was briefly superseded by
See also
References
- Wired. Retrieved 2010-02-07.
- S2CID 206511320. Retrieved 2013-07-31.
- ^ "Quantum Clock Proves to be as Accurate as World's Most Accurate Clock". azonano.com. 7 March 2008. Retrieved 2012-11-06.
- ^ Swenson, Gayle (7 June 2010). "Press release: NIST 'Quantum Logic Clock' Rivals Mercury Ion as World's Most Accurate Clock". NIST.
- ^ NIST's Second 'Quantum Logic Clock' Based on Aluminum Ion is Now World's Most Precise Clock Archived 2010-09-05 at the Wayback Machine, NIST, 4 February 2010
- ^
C.W Chou; D. Hume; J.C.J. Koelemeij; D.J. Wineland & T. Rosenband (17 February 2010). "Frequency Comparison of Two High-Accuracy Al+ Optical Clocks" (PDF). Physical Review Letters. 104 (7): 070802. S2CID 13936087. Retrieved 9 February 2011.
- ^ "NIST's Second 'Quantum Logic Clock' Based on Aluminum Ion is Now World's Most Precise Clock" (Press release). National Institute of Standards and Technology. 4 February 2010. Archived from the original on 2010-09-05. Retrieved 2012-11-04.
- NIST. August 26, 2009. Retrieved 2 May 2011.
- ^ S2CID 119075546.
- ^ a b Wills, Stewart (July 2019). "Optical Clock Precision Breaks New Ground".
- ^ S2CID 199119436.
- ^ (some content of it has been used here).
- ^ "Timekeeping theory combines quantum clocks and Einstein's relativity". phys.org. Retrieved 10 November 2020.
- ^ O'Callaghan, Jonathan. "Quantum Time Twist Offers a Way to Create Schrödinger's Clock". Scientific American. Retrieved 10 November 2020.
- S2CID 4461081.
- ^ Yasuda, Masami; Ido, Tetsuya. "Report from TCTF/TCL JWG on Optical Frequency Metrology, TCTF Meeting, Delhi, India, 27 November 2017". APMP. Asia-Pacific Metrology Programme. Retrieved 8 November 2021.
- PMID 25898253.
- ^ JILA Scientific Communications (21 April 2015). "About Time". Archived from the original on 19 September 2015. Retrieved 27 June 2015.
- ^ Laura Ost (21 April 2015). "Getting Better All the Time: JILA Strontium Atomic Clock Sets New Record". National Institute of Standards and Technology. Retrieved 17 October 2015.
- ^ James Vincent (22 April 2015). "The most accurate clock ever built only loses one second every 15 billion years". The Verge. Retrieved 26 June 2015.