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Search Results: 1 - 10 of 2506 matches for " Oleg Shtempluck "
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Self-oscillations in a superconducting stripline resonator integrated with a DC-SQUID
Eran Segev,Oren Suchoi,Oleg Shtempluck,Eyal Buks
Physics , 2009,
Abstract: We study self-sustained oscillations (SO) in a Nb superconducting stripline resonators (SSR) integrated with a DC superconducting quantum interface devices (SQUID). We find that both the power threshold where these oscillations start and the oscillations frequency are periodic in the applied magnetic flux threading the SQUID loop. A theoretical model which attributes the SO to a thermal instability in the DC-SQUID yields a good agreement with the experimental results. This flux dependant nonlinearity may be used for quantum state reading of a qubit-SSR integrated device.
Signal amplification in a nanomechanical Duffing resonator via stochastic resonance
Ronen Almog,Stav Zaitsev,Oleg Shtempluck,Eyal Buks
Physics , 2006, DOI: 10.1063/1.2430689
Abstract: We experimentally study stochastic resonance in a nonlinear bistable nanomechanical resonator. The device consists of a PdAu doubly clamped beam serving as a nanomechanical resonator excited capacitively by an adjacent gate electrode and its vibrations are detected optically. The resonator is tuned to its bistability region by an intense pump near a point of equal transition rates between its two metastable states. The pump is amplitude modulated, inducing modulation of the activation barrier between the states. When noise is added to the excitation, the resonator's displacement exhibits noise dependent amplification. We measure the resonator's response in the time and frequency domains, the spectral amplification and the statistical distribution of the jump time.
Stochastic Resonance with a Single Metastable State
Eran Segev,Baleegh Abdo,Oleg Shtempluck,Eyal Buks
Physics , 2007, DOI: 10.1103/PhysRevB.77.012501
Abstract: We study thermal instability in NbN superconducting stripline resonators. The system exhibits extreme nonlinearity near a bifurcation, which separates a monostable zone and an astable one. The lifetime of the metastable state, which is locally stable in the monostable zone, is measure near the bifurcation and the results are compared with a theory. Near bifurcation, where the lifetime becomes relatively short, the system exhibits strong amplification of a weak input modulation signal. We find that the frequency bandwidth of this amplification mechanism is limited by the rate of thermal relaxation. When the frequency of the input modulation signal becomes comparable or larger than this rate the response of the system exhibits sub-harmonics of various orders.
Nonlinear Induction Detection of Electron Spin Resonance
Gil Bachar,Oren Suchoi,Oleg Shtempluck,Aharon Blank,Eyal Buks
Physics , 2012, DOI: 10.1063/1.4734500
Abstract: We present a new approach to the induction detection of electron spin resonance (ESR) signals exploiting the nonlinear properties of a superconducting resonator. Our experiments employ a yttrium barium copper oxide (YBCO) superconducting stripline microwave (MW) resonator integrated with a microbridge. A strong nonlinear response of the resonator is thermally activated in the microbridge when exceeding a threshold in the injected MW power. The responsivity factor characterizing the ESR-induced change in the system's output signal is about 100 times larger when operating the resonator near the instability threshold, compared to the value obtained in the linear regime of operation. Preliminary experimental results, together with a theoretical model of this phenomenon are presented. Under appropriate conditions nonlinear induction detection of ESR can potentially improve upon the current capabilities of conventional linear induction detection ESR.
Signal Amplification in NbN Superconducting Resonators via Stochastic Resonance
Baleegh Abdo,Eran Arbel-Segev,Oleg Shtempluck,Eyal Buks
Physics , 2006, DOI: 10.1016/j.physleta.2007.05.103
Abstract: We exploit nonlinearity in NbN superconducting stripline resonators, which is originated by local thermal instability, for studying stochastic resonance. As the resonators are driven into instability, small amplitude modulated (AM) microwave signals are amplified with the aid of injected white noise. The dependence of the signal amplification on the modulation amplitude and the modulation frequency is examined and compared with theory.
Unexpected Nonlinear Dynamics in NbN Superconducting Microwave Resonators
Baleegh Abdo,Eran Segev,Oleg Shtempluck,Eyal Buks
Physics , 2005, DOI: 10.1103/PhysRevB.73.134513
Abstract: In this work we characterize the unusual nonlinear dynamics of the resonance response, exhibited by our NbN superconducting microwave resonators, using different operating conditions. The nonlinear dynamics, occurring at relatively low input powers (2-4 orders of magnitude lower than Nb), and which include among others, bifurcations in the resonance curve, hysteresis loops and resonance frequency shift, are measured herein using varying temperature, applied magnetic field, white noise and rapid frequency sweeps. Based on these measurement results, we consider a hypothesis according to which Josephson junctions forming weak links at the boundaries of the NbN grains are responsible for the observed behavior, and we show that most of the experimental results are qualitatively consistent with such hypothesis.
Fabrication of Nb/Al(AlOx)/Nb DC SQUID by focused ion beam sculpturing
D. Yuvaraj,Gil Bachar,Oren Suchoi,Oleg Shtempluck,Eyal Buks
Physics , 2011,
Abstract: Highly reproducible Nb/Al(AlOx)/Nb Josephson junction based direct current superconducting quantum interference devices (DC SQUID) were fabricated by three dimensional etching using focused ion beam. Hysteretic and non-hysteretic DC SQUID with critical current ranging from 25 to 1100 microampere were fabricated by varying the Al barrier and oxygen exposure time. The fabricated DC SQUIDs have shown periodic flux dependence with high modulation factor reaching a value of 92% at 4.2 K.
Novel Self-Sustained Modulation in Superconducting Stripline Resonators
Eran Segev,Baleegh Abdo,Oleg Shtempluck,Eyal Buks
Physics , 2006, DOI: 10.1209/0295-5075/78/57002
Abstract: We study thermal instability in a driven superconducting NbN resonator integrated with a microbridge. A monochromatic input drive is injected into the resonator and the response is measured as a function of the frequency and amplitude of the drive. Inside a certain zone in the frequency-amplitude plane the system has no steady state, and consequently self-sustained modulation of the reflected power off the resonator is generated. A theoretical model, according to which the instability originates by a hot spot forming in the microbridge, exhibits a good quantitative agreement with the experimental results.
Extreme Nonlinear Phenomena in NbN Superconducting Stripline Resonators
Eran Arbel-Segev,Baleegh Abdo,Oleg Shtempluck,Eyal Buks
Physics , 2006,
Abstract: We study a microwave superconducting stripline resonator made of NbN on a Sapphire wafer. Novel, self-sustained modulation of the reflected power off the resonator, at frequencies of up to 60MHz, has been recently reported. Here we show experimentally that near the self modulation threshold, the device exhibits a giant nonlinearity, which manifests itself in an extremely high intermodulation gain, accompanied by a very strong noise squeezing and period doubling of various orders. Such a device is highly suitable for serving as a readout device in quantum data processing systems.
Thermal Instability and Self-Sustained Modulation in Superconducting NbN Stripline Resonators
Eran Arbel-Segev,Baleegh Abdo,Oleg Shtempluck,Eyal Buks
Physics , 2006,
Abstract: We study theoretically and experimentally the response of a microwave superconducting stripline resonator, integrated with a microbridge, to a monochromatic injected signal. We find that there is a certain range of driving parameters, in which a novel nonlinear phenomenon immerges, and self-sustained modulation of the reflected power off the resonator is generated by the resonator. A theoretical model which attributes the self modulation to a thermal instability yields a good agreement with the experimental results.
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