Trapped-ion optical clocks can observe quantum signatures of proper time such as vacuum-induced second-order Doppler shifts and proper-time interferometry when atomic motion is squeezed.
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Two Doppler-free multiphoton schemes achieve microsecond coherent control of the 88Sr 1S0–3P0 clock transition on 3e6 free-space thermal atoms, suppressing Doppler dephasing 1000-fold versus single-photon excitation.
A geodesic interferometer with a single photon in Kerr spacetime uses combined time-delay and polarization-rotation phases to estimate specific angular momentum with uncertainty characterization.
Experimental measurement of the 87Sr clock transition magic wavelength at 497.4363(3) nm, providing deeper traps and higher sensitivity than the 813 nm wavelength.
citing papers explorer
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Quantum signatures of proper time in optical ion clocks
Trapped-ion optical clocks can observe quantum signatures of proper time such as vacuum-induced second-order Doppler shifts and proper-time interferometry when atomic motion is squeezed.
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Microsecond-Scale Coherent Control of a Forbidden Clock Transition with Doppler-Free Multiphoton Excitations
Two Doppler-free multiphoton schemes achieve microsecond coherent control of the 88Sr 1S0–3P0 clock transition on 3e6 free-space thermal atoms, suppressing Doppler dephasing 1000-fold versus single-photon excitation.
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The role of Wigner rotation in estimating the specific angular momentum of a Kerr spacetime
A geodesic interferometer with a single photon in Kerr spacetime uses combined time-delay and polarization-rotation phases to estimate specific angular momentum with uncertainty characterization.
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Turquoise Magic Wavelength of the ${}^{87}$Sr Clock Transition
Experimental measurement of the 87Sr clock transition magic wavelength at 497.4363(3) nm, providing deeper traps and higher sensitivity than the 813 nm wavelength.