Matt Jones Precision Tests of Fundamental Physics using Strontium Clocks Outline
Clavenna, Scott, Founder and CEO has reference to this Academic Journal, PHwiki organized this Journal Matt Jones Precision Tests of Fundamental Physics using Strontium Clocks Outline Atomic clocks The strontium lattice clock Testing fundamental physics Entanglement in addition to clocks Atomic clocks The second The second is the duration of 9 192 631 770 periods of the radiation corresponding to the transition between two hyperfine levels of the ground state of the caesium 133 atoms (at 0K). The metre: The metre is the length of the path travelled by light in vacuum during a time interval of 1/299 792 458 of a second. Current accuracy: 1 × 10-15
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Cs primary st in addition to ard Oscillator Counter Feedback Source: NIST Ramsey interferometry Ramsey interferometry R. Wyn in addition to s in addition to S. Weyers, Metrologia 42 (2005) S64-S79 PTB
Doing better Higher Q No collisions Strontium lattice clock 461 nm G/2p = 32 MHz 3P 698 nm G/2p = 1 mHz M. Takamoto et al., Nature 435, 321 (2005) Magic lattices No Doppler shift Long interrogation times Reduced collisions
Optical clockwork Optical atomic clocks Courtesy of H. Margolis, NPL C. W. Chou et al., quant-ph/0911.4572 (2010) M. D. Swallow et al., quant-ph/1007.0059 (2010) G. K. Campbell et al., Metrologia 45, 539 (2008) Testing fundamental physics Relativity 10-16 is a difference in height of just 1m Time variation of fundamental constants Non-Newtonian short range as long as ces
Time variation of fundamental constants Motivation Cosmology Some models predict that in addition to µ were different in the early universe Unified field theories Constants couple to gravity Implies a violation of Local Position Invariance Principle Measure how Sr/Cs varies with time
Results Short-range as long as ces Do theories with compactified dimensions modify gravity at short range Lattice clocks at Durham EPSRC proposal: Entanglement-enhanced enhanced optical frequency metrology using Rydberg states Collaborators: National Physical Laboratories University of Nottingham Panel sits tomorrow!!
Lattice clocks at Durham Normal clock Entangled clock Summary Atomic clocks provide the most accurate measurements Optical atomic clocks have lead to a new frontier This can be used as long as precision tests of our fundamental theories References Fountain clocks R. Wyn in addition to s in addition to S. Weyers, Metrologia 42 (2005) S64-S79 Fundamental physics tests S. Blatt et al., Phys. Rev. Lett. 100, 140801 (2008) P. Wolf et al., Phys. Rev. A 75, 063608 (2007) F. Sorrentino et al., Phys. Rev. A 79, 013409 (2009) Optical clocks M. Takamoto et al., Nature 435, 321 (2009) C. W. Chou et al., quant-ph/0911.4572 (2010) M. D. Swallow et al., quant-ph/1007.0059 (2010) G. K. Campbell et al., Metrologia 45, 539 (2008)
Clavenna, Scott Founder and CEO
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