Article
Physics, Applied
Rintaro Fujimoto, Shoichi Murakami, Toshiki Kobayashi, Rikizo Ikuta, Shigehito Miki, Shigeyuki Miyajima, Masahiro Yabuno, Fumihiro China, Hirotaka Terai, Nobuyuki Imoto, Takashi Yamamoto
Summary: In this study, we demonstrated the coincidence measurement of quantum light using superconducting nanowire single-photon detectors with a single-flux-quantum (SFQ) circuit as a signal processing circuit. Through quantum state tomography of a polarization-entangled photon pair, the evaluation of the detection system based on the SFQ coincidence circuit showed an estimated fidelity almost equivalent to that obtained with a detection system based on a conventional time-to-digital converter.
APPLIED PHYSICS EXPRESS
(2021)
Article
Multidisciplinary Sciences
L. M. Arevalo Aguilar
Summary: In 1927, Einstein conducted a thought experiment at the Solvay conference to demonstrate the incompleteness of quantum mechanics. By using the Stern-Gerlach experiment, he showed that single-particle entanglement can produce nonlocal effects, opening up the possibility of implementing truly nonlocal tasks.
SCIENTIFIC REPORTS
(2021)
Article
Multidisciplinary Sciences
Ye Yang, Yaqing Jin, Xiao Xiang, Tengfei Hao, Wei Li, Tao Liu, Shougang Zhang, Ninghua Zhu, Ruifang Dong, Ming Li
Summary: This paper reports a novel concept of single-photon microwave photonics (SP-MWP) and demonstrates a SP-MWP signal processing system with phase shifting and frequency filtering functionalities based on a superconducting nanowire single-photon detector and a successive time-correlated single photon counting module. The experimental results show that ultrahigh optical sensitivity and ultrahigh anti-interference capability have been achieved.
Article
Physics, Applied
P. Navez, A. G. Balanov, S. E. Savel'ev, A. M. Zagoskin
Summary: By using the formalism of quantum electrodynamics, we have developed a comprehensive theoretical framework to describe the interaction between single microwave photons and an array of superconducting transmon qubits in a waveguide cavity resonator. Our analysis reveals the effects of microwave photons on the array's response to a weak probe signal, showing that high quality factor cavities provide better spectral resolution, while moderate quality factor cavities offer better sensitivity for single-photon detection. Surprisingly, our results demonstrate that even a single qubit in a cavity can detect a single-photon signal under realistic system parameters. We also discuss the influence of quantum properties and electrodynamical properties on the response of qubit arrays. This study provides an efficient theoretical foundation for the development and design of quantum devices with qubit arrays, especially those using cavities with explicit expressions for transmission or reflection.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Physics, Applied
Arne L. Grimsmo, Baptiste Royer, John Mark Kreikebaum, Yufeng Ye, Kevin O'Brien, Irfan Siddiqi, Alexandre Blais
Summary: The paper introduces a single-photon detector design operating in the microwave domain, based on weakly nonlinear metamaterial for high-accuracy single-photon detection and large detection bandwidth. This design offers promising possibilities for the development of quantum information processing, quantum optics, and metrology.
PHYSICAL REVIEW APPLIED
(2021)
Article
Quantum Science & Technology
Chuang Li, Ying Dong, Jiandong Zhang, Yan Xia, Jie Song, Weiqiang Ding
Summary: In this study, a simple and novel scheme to generate a NOON state for trapped atoms in two separate cavities using single-photon detection is proposed. The fidelity of the NOON state is observed to decrease in the presence of dissipation, but an effective protocol is suggested to improve the fidelity and achieve a high-fidelity many-atom NOON state. The proposed scheme is feasible with current technology.
QUANTUM INFORMATION PROCESSING
(2021)
Article
Physics, Multidisciplinary
Jikun Xie, Shengli Ma, Yalong Ren, Xinke Li, Shaoyan Gao, Fuli Li
Summary: We propose a novel scheme for coherent quantum transduction between microwave and optical signals based on a hybrid magnonic system. By utilizing a YIG sphere with optomechanical and optomagnetic properties to couple with a superconducting microwave resonator, we demonstrate the realization of nonreciprocal single-photon state conversion between microwave and optical modes through quantum interference effect.
NEW JOURNAL OF PHYSICS
(2023)
Review
Optics
Stefano Dello Russo, Arianna Elefante, Daniele Dequal, Deborah Katia Pallotti, Luigi Santamaria Amato, Fabrizio Sgobba, Mario Siciliani de Cumis
Summary: This review reports on the current state of the art of single-photon detectors operating in the mid-infrared wavelength range and discusses the technological challenge of transitioning from near-infrared detectors to mid-infrared detection. Different approaches are explored, and the three most promising solutions are described in detail.
Article
Optics
D. M. Walker, L. L. Brown, S. D. Hogan
Summary: The electric-field distribution in a single mode of a lambda/4 superconducting coplanar waveguide (CPW) microwave resonator has been probed using beams of helium Rydberg atoms. The coherence times of the atom-resonator-field interaction and the atomic superposition states were determined, and residual uncanceled dc electric fields were measured.
Article
Optics
Gaurav Shukla, Dariya Salykina, Gaetano Frascella, Devendra Kumar Mishra, Maria Chekhova, Farit Ya Khalili
Summary: In this theoretical study, we investigate the possibility of broadening the phase range of sub-shot-noise sensitivity in a squeezing-enhanced linear interferometer by implementing detection in both output ports and optimizing the combination of detector outputs. This modification allows the interferometer to maintain phase sensitivity independent of the operation point and remain unaffected by laser technical noise, similar to the standard dark port regime. Additionally, by using phase-sensitive amplifiers before each detector, the sensitivity can also tolerate detection loss.
Article
Multidisciplinary Sciences
Qi Zhang, Yuhang Guo, Wentao Ji, Mengqi Wang, Jun Yin, Fei Kong, Yiheng Lin, Chunming Yin, Fazhan Shi, Ya Wang, Jiangfeng Du
Summary: The nitrogen-vacancy (NV) center in diamond is crucial for achieving high-fidelity single-shot readout of qubits, with a new spin-to-charge conversion method introduced to suppress spin-flip errors. This technique shows potential for exceeding fault-tolerant thresholds and may have applications in integrated optoelectronic devices.
NATURE COMMUNICATIONS
(2021)
Article
Engineering, Multidisciplinary
Vitor Silva Tavares, Felipe Calliari, Elisabeth Costa Monteiro, Guilherme Penello Temporao
Summary: In this paper, a method for evaluating the impact of the detection gate width of an InGaAs/InP single-photon avalanche diode detector is proposed. The method involves analyzing the probability of detecting photons and the variation of the average number of photons per gate. Results show that using gate widths of 4 ns and 8 ns provide an adequate optical power range for calibration.
Article
Physics, Multidisciplinary
Wei Li, Renming Liu, Junyu Li, Jie Zhong, Yu-Wei Lu, Huanjun Chen, Xue-Hua Wang
Summary: A highly efficient approach for achieving strong coupling between single excitons and localized plasmon modes at room temperature is presented. By reducing the critical interaction strength at the exceptional point, rather than enhancing the coupling strength, the researchers were able to overcome the system's large damping. Experimental results showed a significant improvement in the success rate of achieving strong coupling, from about 1% to about 80%.
PHYSICAL REVIEW LETTERS
(2023)
Article
Optics
Shanhui Rituraj, Shanhui Fan, Zhi-Gang Yu, Paul Boieriu, Srini Krishnamurthy
Summary: This article introduces an efficient biphoton emission process in semiconductors, which can enable highly tunable lasers, squeezed light sources, and entangled photon pair sources on an integrated platform. The authors propose a general single-photon recycling scheme to improve the overall efficiency of biphoton emission in a broad class of semiconductor materials. By using a rate-equation-based analysis, they design a one-dimensional photonic crystal cavity that reaches the ideal photon recycling limit for spontaneously emitted single photons. The cavity is designed with realistic constituent materials to achieve high biphoton output efficiency in the absence of nonradiative recombination channels.
Article
Nanoscience & Nanotechnology
Pei-Chun Yeh, Genki Ohkatsu, Ryo Toyama, Phan Trong Tue, Kostya (Ken) Ostrikov, Yutaka Majima, Wei-Hung Chiang
Summary: The study demonstrates a simple and controlled fabrication method of graphene quantum dot (GQD)-based single-electron transistors (SETs) for photon detectors. The GQD-SETs fabricated enable photon detection with 410 nm excitation due to the photoluminescence emission capability of GQDs.
Article
Multidisciplinary Sciences
Bayan Karimi, Fredrik Brange, Peter Samuelsson, Jukka P. Pekola
NATURE COMMUNICATIONS
(2020)
Article
Physics, Applied
Bayan Karimi, Hans He, Yu-Cheng Chang, Libin Wang, Jukka P. Pekola, Rositsa Yakimova, Naveen Shetty, Joonas T. Peltonen, Samuel Lara-Avila, Sergey Kubatkin
Summary: This study examines the basic charge and heat transport properties of charge-neutral epigraphene at sub-kelvin temperatures, revealing a nearly logarithmic dependence of electrical conductivity over a wide temperature range. By using graphene's sheet conductance as an in-situ thermometer, the researchers demonstrated electron-phonon heat transport at millikelvin temperatures following the T-4 dependence of a clean two-dimensional conductor. Based on their measurements, they predict the noise-equivalent power of epigraphene bolometers to be around 10^-22 W/Hz at very low temperatures.
APPLIED PHYSICS LETTERS
(2021)
Review
Physics, Multidisciplinary
Jukka P. Pekola, Bayan Karimi
Summary: Recent advances in quantum heat transport, including theoretical basis, experimental investigations, and applications in devices, were reviewed in the colloquium. The research shows that quantum heat transport can be controlled by electric and magnetic fields for various thermal device applications.
REVIEWS OF MODERN PHYSICS
(2021)
Article
Physics, Multidisciplinary
Jukka P. Pekola, Bayan Karimi
Summary: This paper investigates the linear coupling between a qubit and a heat bath, and focuses on calorimetric detection in a realistic circuit. It proposes a new technique to enhance the signal-to-noise ratio of the calorimeter.
Article
Physics, Applied
Florian Blanchet, Yu-Cheng Chang, Bayan Karimi, Joonas T. Peltonen, Jukka P. Pekola
Summary: This study introduces a new scheme for a Coulomb-blockade thermometer (CBT) and demonstrates measurements in a microwave-transmission setup. The signal obtained from a transmission measurement is directly proportional to the conductance of the CBT, enabling calibration-free operation. The rf measurement offers a significant speed advantage, allowing for faster measurements compared to standard dc setups.
PHYSICAL REVIEW APPLIED
(2022)
Article
Physics, Applied
Bayan Karimi, Yu-Cheng Chang, Jukka P. Pekola
Summary: In this technical note, the temperature dependence and saturation phenomenon of tunnel junctions between a superconductor and a normal metal (NIS junction) are reanalyzed, and it is shown that the quantitatively low temperature behavior can be explained by the temperature independent subgap current of the junction alone in some cases.
JOURNAL OF LOW TEMPERATURE PHYSICS
(2022)
Article
Instruments & Instrumentation
Jukka P. Pekola, Eemil Praks, Nikolai Yurttagul, Bayan Karimi
Summary: This paper investigates the temperature uncertainty of a Coulomb blockade thermometer (CBT) caused by inevitable non-uniformities in tunnel junction arrays. The corrections are proportional to the variance of the junction resistance in the linear operation regime, and this relationship holds approximately beyond the originally studied high temperature range. Analytical and numerical results are presented, and their implications on achievable uniformity based on state-of-the-art fabrication of sensors are briefly discussed.
Article
Physics, Multidisciplinary
Jukka P. Pekola, Marco Marin-Suarez, Tuomas Pyharanta, Bayan Karimi
Summary: This theoretical analysis of a system for converting frequency to power reveals that the main errors come from the inaccuracy of injecting electrons and subgap leakage. The study shows that systematic errors in detection can be significantly reduced compared to injection errors, and with proper system parameters, injection errors can be very small at low temperatures.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
E. Gumus, D. Majidi, D. Nikolic, P. Raif, B. Karimi, J. T. Peltonen, E. Scheer, J. P. Pekola, H. Courtois, W. Belzig, C. B. Winkelmann
Summary: Josephson junctions play a central role in superconducting quantum technology, and irreversibility arises from sudden slips of the quantum phase difference across the junction. By detecting the instantaneous heat release caused by a phase slip, this study provides insights into the ubiquity of dissipation in quantum devices, particularly in superconducting quantum sensors and qubits. This advancement in experimental quantum thermodynamics allows for the observation of heat in elementary quantum processes.
News Item
Physics, Multidisciplinary
Bayan Karimi, Jukka P. Pekola
Summary: A real qubit is affected by noise from its environment. An experiment has demonstrated the ability to control the environment using the qubit itself.
Article
Mathematics, Applied
Jukka P. Pekola, Bayan Karimi, Marco Cattaneo, Sabrina Maniscalco
Summary: We discuss the long-time relaxation of a qubit linearly coupled to a finite bath of N spins (two-level systems, TLSs), with interesting observations about the effective system relaxation. Despite being perfectly integrable, the qubit relaxes exponentially towards its zero-temperature state, while the bath spins form a Lorentzian distribution peaked at the frequency of the initially excited qubit.
OPEN SYSTEMS & INFORMATION DYNAMICS
(2023)
Article
Materials Science, Multidisciplinary
Danilo Nikolic, Bayan Karimi, Diego Subero Rengel, Jukka P. Pekola, Wolfgang Belzig
Summary: A mesoscopic thermometer for ultrasensitive detection based on the proximity effect in superconductor-normal metal (SN) heterostructures is proposed. The thermometer utilizes the zero-bias anomaly caused by inelastic Cooper-pair tunneling in an SNIS junction coupled to an ohmic electromagnetic environment. A simplified analytic treatment is also proposed, which agrees well with numerical results and can be used for the development, calibration, and optimization of such devices in future experiments.
Article
Materials Science, Multidisciplinary
Bayan Karimi, Jukka P. Pekola
Summary: This article discusses the nonzero-frequency noise of heat current using the example of thermal photons in a circuit. A setup with two resistors forming heat baths composed of bosonic oscillators is described, providing a convenient way to deal with noise. The method presented in the article can convert high-frequency quantum noise into zero frequency for easier measurement.
Article
Physics, Multidisciplinary
Jorden Senior, Azat Gubaydullin, Bayan Karimi, Joonas T. Peltonen, Joachim Ankerhold, Jukka P. Pekola
COMMUNICATIONS PHYSICS
(2020)
