visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나
날짜 2020-09-24 09:00 
연사  
장소 Zoom Video 

Speaker: Akash V. Dixit (University of Chicago)

 

Date: September 24, 2020 (Thursday)

 

Time: 9:00 AM

 

Venue: Zoom Video Conference System (Please click the link below)

 

https://kaist.zoom.us/j/6108068959?pwd=TXV2OGlWdVRtcGhmNXVTRWlla2pHQT09


Meeting ID: 610 806 8959
 

Passcode: 131015

 

Topic: Searching for Dark Matter with a Superconducting Qubit

Abstract:

The gravitational evidence for the existence of dark matter is extensive 1 , yet thus far, dark matter has evaded direct detection in terrestrial experiments. Detection mechanisms for low mass dark matter candidates such as the axion 2–5 or hidden photon 6,7 leverage potential interactions with electromagnetic fields, whereby the dark matter (of unknown mass) on rare occasion converts into a single photon 8,7. Current dark matter searches operating at microwave frequencies, use a resonant cavity to coherently accumulate the field sourced by the dark matter and use a quantum limited linear amplifier to read out the cavity signal 9–12. Here, we report the development of a novel microwave photon counting technique and use it to set a new exclusion limit on hidden photon dark matter. We constrain the kinetic mixing angle to  ≤ 1.82 × 10−15 in a narrow band around 6.011 GHz (24.86 µeV) with an integration time of 8.33 s. We operate a superconducting qubit to make repeated quantum non-demolition measurements of cavity photons and apply a hidden Markov model analysis to reduce the noise to 15.7 dB below the quantum limit, with performance limited by the residual population of the system. The techniques presented here will dramatically improve the sensitivity of future dark matter searches in the range of 3-30 GHz and are generally applicable to measurements that require high sensitivity to inherently low signal photon rates.

 
 

Seminar Invitation (September 24, 2020), 4 PM

 
Speaker: Dr. Boris Ivanov (Novosibirsk State Technical University)


Date: September 24, 2020 (Thursday)

Time: 4:00 PM

Venue: Webinar Video Conference System (Please click the link below)

https://webinar.kafe.or.kr

Seminar Name: Cryogenic Microwave Circuit Development at the NSTU

Password: None

 

Topic: Cryogenic Microwave Circuit Development at the NSTU

Abstract:

During the seminar I am going to show the last scientific results of 4 research performed in the Laboratory of Quantum and Cryogenic Electronics. I will concentrate the major part of the talk around cryogenic amplifiers design, development and characterization. Thus, the cryogenic low noise amplifier with the noise temperature of 6 K and gain value of more than 30 dB is shown for the frequency range from 6 to 12 GHz. Based on such microwave amplifiers the superconducting X-mon qubit structures were measured. The experiments with qubits were performed at continues microwave field and with short microwave pulses. The qubit energy spectrums were obtained and based on the AC-Stark experiment the low average photon number close to single photon mode in qubit-resonator structure was obtained. From the other side for the bolometer circuits readout and Josephson junctions measurements the low frequency cryogenic amplifiers were designed and characterized. The minimum voltage noise density corresponds to 150 pV/root(Hz) with the gain value of more than 60 dB for the presented amplifiers.

번호 날짜 연사 제목
556 2015-07-16 16:00    Next-generation ultrafast laser technology for nonlinear optics and strong-field physics
555 2015-07-16 16:00    KAIST Physics Distinguished Lecture
554 2015-07-23 13:30    Enhanced ZnO based UV photonics and related applications file
553 2015-08-03 10:30    Axion Search
552 2015-08-04 11:00    Propagation of ultrasound through two- and three-dimensional strongly scattering media
551 2015-09-07 15:00    Advanced Optical Materials and Devices at NRL
550 2015-09-07 16:00    Physics Colloquium : 2015 Fall file
549 2015-09-14 14:00    Ultrafast X-ray Studies on Dynamics Matter in Extreme Conditions
548 2015-09-15 16:00    Physics Colloquium : 2014 Fall file
547 2015-10-14 18:00    인터스텔라 영화 속의 물리 file
546 2015-10-15 10:00    Development of Large-Bore, High Field Magnets at the NHMFL
545 2015-10-16 15:00    High Magnetic Fields to Probe the sub-eV range of Particle/Astroparticle Physics - From the OSQAR experiments at CERN up to new perspectives at LNCMI-Grenoble
544 2015-10-16 16:00    Fluctuations of entropy production in partially masked electric circuits
543 2015-10-23 10:30    How to write a good scientific paper[Open lecture series]
542 2015-10-23 15:00    Development of a Rogowski Coil as a new beam position monitor
541 2015-11-06 16:30    Topological Dirac line nodes in centrosymmetric semimetals
540 2015-11-10 16:00    Rapid heating of matter using high power lasers
539 2015-11-19 16:00    Emergent Collective Phenomena and Functions at Reduced Dimensions
538 2015-11-23 13:30    What's Beyond the Standard Model? Lessons from Run I and what might come in Run II
537 2015-11-24 16:00    Topology-based understanding of spin dynamics in inhomogeneously magnetized systems