J. Grotti, I. Nosske, S.B. Koller, S. Herbers, H. Denker, L. Timmen, G. Vishnyakova, G. Grosche, T. Waterholter, A. Kuhl, S. Koke, E. Benkler, M. Giunta, L. Maisenbacher, A. Matveev, S. Dörscher, R. Schwarz, A. Al-Masoudi, T.W. Hänsch, Th. Udem, R. Holzwarth, and C. Lisdat
Phys. Rev. Applied 21, L061001 (2024) – Published 3 June 2024
Transportable optical clocks are of great interest for applications in geodesy, because they allow the measurement of geopotential differences with high resolution via their relativistic redshift. So far demonstrations have been limited to short distances or low resolution, but this study presents a measurement between two laboratories separated by several hundred kilometers, with physical height resolution at the decimeter level. The authors compare the result to those obtained with the most accurate established methods in geodesy. Their approach is expected to lead to improved continental and global height reference frames, and connection of tide gauges for sea-level monitoring.
Z. Y. Ma, K. Deng, Z. Y. Wang, W. Z. Wei, P. Hao, H. X. Zhang, L. R. Pang, B. Wang, F. F. Wu, H. L. Liu, W. H. Yuan, J. L. Chang, J. X. Zhang, Q. Y. Wu, J. Zhang, and Z. H. Lu
Phys. Rev. Applied 21, 044017 (2024) – Published 8 April 2024
Phys. Rev. Applied 21, L031003 (2024) – Published 6 March 2024
Rydberg microwave electrometry has attracted great attention, due to its potential application in radar and communication, but simultaneously achieving high sensitivity and broad instantaneous bandwidth remains a challenge. This study demonstrates an enhanced instantaneous bandwidth of ±10.2 MHz with sensitivity of 62 nV cm Hz by the amplification of one sideband wave in the six-wave-mixing process of a Rydberg superheterodyne receiver.
Phys. Rev. Applied 20, L061002 (2023) – Published 14 December 2023
In the rapidly developing cold-atom-qubit platform, off-resonant modulated driving (ORMD) allows us to realize good two-qubit entangling gates. To achieve high fidelities with Rydberg-blockade gates under practical conditions, the high-frequency components in a modulation pattern must be dealt with. This study’s filtering approach is applicable to constructing entangling gates that work at finite Rydberg-blockade strength, and to overcome the residual thermal motion of qubit atoms. These results are expected to provide an essential upgrade for such gates.
Adrian Solyom, Michael Caouette-Mansour, Brandon Ruffolo, Patrick Braganca, Lilian Childress, and Jack C. Sankey
Phys. Rev. Applied 20, 054055 (2023) – Published 28 November 2023
Nanoscale magnetic circuits provide an alternate paradigm for computation and signal processing, but characterizing the GHz-frequency magnetic dynamics in these systems has been challenging. The authors use the single spin of a nitrogen-vacancy (N-) center in diamond to probe nanoscale magnetic fields in the GHz regime, identifying signatures of a free-running and phase-locked spin-torque oscillator in the fluorescence spectrum of a proximal N-, and measure how the dynamics impact the N-’s spin relaxation. This technique could enable new sensing modalities for revealing the nanoscale structure of GHz-frequency dynamics in emerging magnetic nanotechnologies.
Synopsis: “Fictitious” Magnetic Fields for Atomic Magnetometers
