@article{20324,
  abstract     = {We report relaxation oscillations in a one-dimensional array of Josephson junctions, wherein the array dynamically switches between low-current and high-current states. The oscillations are current-voltage dual to those ordinarily observed in single junctions. The current-voltage dual circuit quantitatively accounts for temporal dynamics of the array, including the dependence on biasing conditions. Injection locking of the oscillations results in well-developed current plateaux. A thermal model explains the self-consistent reduction of the superconducting gap due to overheating of the array in the high-current state. Our work suggests that overheating determines the switching from the high-current state to the low-current state.},
  author       = {Mukhopadhyay, Soham and Lancheros Naranjo, Diego A and Senior, Jorden L and Higginbotham, Andrew P},
  issn         = {2331-7019},
  journal      = {Physical Review Applied},
  publisher    = {American Physical Society},
  title        = {{Dual relaxation oscillations in a Josephson-junction array}},
  doi          = {10.1103/qvls-7s3q},
  volume       = {24},
  year         = {2025},
}

@article{19617,
  abstract     = {In this article, we propose a method for generating single microwave photons in superconducting circuits. We theoretically show that pure single microwave photons can be generated on demand and tuned over a large frequency band by making use of Landau-Zener transitions under a rapid sweep of a control parameter. We devise a protocol that enables fast control of the frequency of the emitted photon over two octaves, without requiring extensive calibration. Additionally, we make theoretical estimates of the generation efficiency, tunability, purity, and linewidth of the photons emitted using this method for both charge- and flux-qubit-based architectures. We also provide estimates of the optimal device parameters required for these architectures to realize the device.},
  author       = {Hawaldar, Samarth and Khaire, Siddhi Satish and Delsing, Per and Suri, Baladitya},
  issn         = {2331-7019},
  journal      = {Physical Review Applied},
  number       = {4},
  publisher    = {American Physical Society},
  title        = {{On-demand single-microwave-photon source in a superconducting circuit with wideband frequency tunability}},
  doi          = {10.1103/physrevapplied.23.044042},
  volume       = {23},
  year         = {2025},
}

@article{21560,
  abstract     = {Scintillation describes the conversion of high-energy particles into light in transparent media and finds diverse applications such as high-energy particle detection and industrial and medical imaging. This process operates on multiple timescales, with the final radiative step consisting of spontaneous emission, which can be modeled within the framework of quasiequilibrium fluctuational electrodynamics. Scintillation can therefore be controlled and enhanced via nanophotonic effects, which has been proposed and experimentally demonstrated. Such designs have thus far obeyed Lorentz reciprocity, meaning there is a direct equivalence between scintillation emission and absorption by the scintillator. However, scintillators that do not obey Lorentz reciprocity have not been explored, even though they represent an alternative platform for probing emission, which is both nonequilibrium and nonreciprocal in nature. In this work, we propose to harness nonreciprocity to achieve directional control of scintillation emission, granting an additional degree of control over scintillation. Such directionality of light output is useful in improving collection efficiencies along the directions where detectors are located. We present the design of a nonreciprocal scintillator using a one-dimensional magnetophotonic crystal in the Voigt configuration. Our work demonstrates the potential of controlling nonequilibrium such as scintillation by breaking reciprocity and expands the space of nanophotonic design for achieving such control.},
  author       = {Long, Olivia Y. and Pajovic, Simo and Roques-Carmes, Charles and Tsurimaki, Yoichiro and Rivera, Nicholas and Soljačić, Marin and Boriskina, Svetlana V. and Fan, Shanhui},
  issn         = {2331-7019},
  journal      = {Physical Review Applied},
  number       = {5},
  publisher    = {American Physical Society},
  title        = {{Nonreciprocal scintillation using one-dimensional magneto-optical photonic crystals}},
  doi          = {10.1103/physrevapplied.22.054062},
  volume       = {22},
  year         = {2024},
}

@article{11438,
  abstract     = {Lasers with well-controlled relative frequencies are indispensable for many applications in science and technology. We present a frequency-offset locking method for lasers based on beat-frequency discrimination utilizing hybrid electronic LC filters. The method is specifically designed for decoupling the tightness of the lock from the broadness of its capture range. The presented demonstration locks two free-running diode lasers at 780 nm with a 5.5-GHz offset. It displays an offset frequency instability below 55 Hz for time scales in excess of 1000 s and a minimum of 12 Hz at 10-s averaging. The performance is complemented with a 190-MHz lock-capture range, a tuning range of up to 1 GHz, and a frequency ramp agility of 200kHz/μs.},
  author       = {Li, Vyacheslav and Diorico, Fritz R and Hosten, Onur},
  issn         = {2331-7019},
  journal      = {Physical Review Applied},
  keywords     = {General Physics and Astronomy},
  number       = {5},
  publisher    = {American Physical Society},
  title        = {{Laser frequency-offset locking at 10-Hz-level instability using hybrid electronic filters}},
  doi          = {10.1103/physrevapplied.17.054031},
  volume       = {17},
  year         = {2022},
}