### 1356 results for qubit oscillator frequency

Contributors: Eugene Grichuk, Margarita Kuzmina, Eduard Manykin

Date: 2010-09-26

**qubit** simulates the behavior of electric field of
polarized light beam...**qubit** model has been designed as a
stochastic **oscillator** formed by a pair...**qubits** that is
exploited as a computation resource in one-way quantum
...**qubit** cluster, is designed, and system of equations for
network dynamics...one-**qubit**
gates are suggested. Changing of cluster entanglement degree...**oscillators** is
proposed for modeling of a cluster of entangled **qubits** ...**oscillators** with chaotically modulated limit cycle radii and
**frequencies**...**oscillators**...**qubit** model has been designed as a
stochastic oscillator formed by a pair ... A network of coupled stochastic **oscillators** is
proposed for modeling of a cluster of entangled **qubits** that is
exploited as a computation resource in one-way quantum
computation schemes. A **qubit** model has been designed as a
stochastic **oscillator** formed by a pair of coupled limit cycle
**oscillators** with chaotically modulated limit cycle radii and
**frequencies**. The **qubit** simulates the behavior of electric field of
polarized light beam and adequately imitates the states of two-level
quantum system. A cluster of entangled **qubits** can be associated
with a beam of polarized light, light polarization degree being
directly related to cluster entanglement degree. Oscillatory network,
imitating **qubit** cluster, is designed, and system of equations for
network dynamics has been written. The constructions of one-**qubit**
gates are suggested. Changing of cluster entanglement degree caused
by measurements can be exactly calculated.

Files:

Contributors: Weidinger, Daniel, Gruebele, Martin

Date: 2007-07-10

**Qubits** are encoded in 2n vibrational computing states on the ground electronic ... Accurate rotation-vibration energy levels and transition dipoles of the molecule thiophosgene are used to model the execution of quantum gates with shaped laser pulses. **Qubits** are encoded in 2n vibrational computing states on the ground electronic surface of the molecule. Computations are carried out by cycling amplitude between these computing states and a gateway state with a shaped laser pulse. The shaped pulse that performs the computation in the computing states is represented by a physical model of a 128-1024 channel pulse shaper. Pulse shapes are optimized with a standard genetic algorithm, yielding experimentally realizable computing pulses. We study the robustness of optimization as a function of the vibrational states selected, rotational level structure, additional vibrational levels not assigned to the computation, and compensation for laser power variation across a molecular ensemble.

Files:

Contributors: Abdul-Niby, M., Alameen, M., Baitie, H.

Date: 2016-12-18

**frequency** synthesis, quadrature signal generation and phase locked loops...**oscillator** (ILO) of 35MHz **frequency**. Phase shifters at high **frequencies**...**oscillator**...**Oscillating** systems, locking of the **oscillators** can take place for injected...**frequency** to nth harmonics of the free-running **frequency**. In this paper ... In Self **Oscillating** systems, locking of the **oscillators** can take place for injected signals close in **frequency** to nth harmonics of the free-running **frequency**. In this paper, we present a simple design for digital phase shift control by using a harmonically injection locked **oscillator** (ILO) of 35MHz **frequency**. Phase shifters at high **frequencies** are essential in many communication system applications such as **frequency** synthesis, quadrature signal generation and phase locked loops (PLLs).

Files:

Contributors: Karlsson, J., Kunkel, N., Ikesue, A., Ferrier, A., Goldner, P.

Date: 2017-02-08

... We have measured inhomogeneous linewidths and coherence times (T2) of nuclear spin transitions in a Eu3+:Y2O3 transparent ceramic by an all-optical spin echo technique. The nuclear spin echo decay curves showed a strong modulation which was attributed to interaction with Y nuclei in the host. The coherence time of the 29 MHz spin transition in 151Eu3+ was 16 ms in a small applied magnetic field. Temperature dependent measurements showed that the coherence time was constant up to 18 K and was limited by spin-lattice relaxation for higher temperatures. Nuclear spin echoes in 153Eu3+ gave much weaker signals than for the case of 151Eu3+. The spin coherence time for the 73 MHz spin transition in 153Eu3+ was estimated to 14 ms in a small magnetic field. The study shows that the spin transitions of ceramic Eu3+:Y2O3 have coherence properties comparable to the best rare-earth-doped materials available. These results have been highlighted in JPhys+, news and views from the Journal of Physics series (IOP): https://jphysplus.iop.org/2017/02/09/long-spin-coherence-lifetime-in-eu3y2o3-ceramic/

Files:

Contributors: de Cheveigné, Alain, Arzounian, Dorothée

Date: 2015-09-27

**Oscillations** are an important aspect of brain activity, but they often...**frequency** bands. Approach. Here, we propose a methodology that reveals...**oscillations**, leading to uncertainty as to the true oscillatory nature...**frequency** analysis kernels have a temporal extent that blurs the time ...**frequency** analysis methods with which it remains complementary.
... Objective. **Oscillations** are an important aspect of brain activity, but they often have a low signal- to-noise ratio (SNR) due to source-to-electrode mixing with competing brain activity and noise. Filtering can improve the SNR of narrowband signals, but it introduces ringing effects that may masquerade as genuine **oscillations**, leading to uncertainty as to the true oscillatory nature of the phenomena. Likewise, time–**frequency** analysis kernels have a temporal extent that blurs the time course of narrowband activity, introducing uncertainty as to timing and causal relations between events and/or **frequency** bands. Approach. Here, we propose a methodology that reveals narrowband activity within multichannel data such as electroencephalography, magnetoencephalography, electrocorticography or local field potential. The method exploits the between-channel correlation structure of the data to suppress competing sources by joint diagonalization of the covariance matrices of narrowband filtered and unfiltered data. Main results. Applied to synthetic and real data, the method effectively extracts narrowband components at unfavorable SNR. Significance. Oscillatory components of brain activity, including weak sources that are hard or impossible to observe using standard methods, can be detected and their time course plotted accurately. The method avoids the temporal artifacts of standard filtering and time–**frequency** analysis methods with which it remains complementary.

Files:

Contributors: Noroozian, Omid

Date: 2018-01-25

... The current state of the art for some superconducting technologies will be reviewed in the context of a future single-dish submillimeter telescope called AtLAST. The technologies reviews include: 1) Kinetic Inductance Detectors (KIDs), which have now been demonstrated in large-format kilo-pixel arrays with photon background-limited sensitivity suitable for large field of view cameras for wide-field imaging. 2) Parametric amplifiers - specifically the Traveling-Wave Kinetic Inductance (TKIP) amplifier - which has enormous potential to increase sensitivity, bandwidth, and mapping speed of heterodyne receivers, and 3) On-chip spectrometers, which combined with sensitive direct detectors such as KIDs or TESs could be used as Multi-Object Spectrometers on the AtLAST focal plane, and could provide low-medium resolution spectroscopy of ~100 objects at a time in each field of view.

Files:

Contributors: Georgiadis, Apostolos, Collado, Ana, Niotaki, Kyriaki

Date: 2015-05-01

**frequency** of the **oscillator**, while the output section is designed to maximize...**frequency** divide-by-3 circuit is presented based on an injection locked...**oscillator**. Substrate integrated waveguide (SIW) technology is used to...**oscillator**...**frequency** divider...**oscillator** circuit. A prototype is fabricated presenting a measured DC-RF...**frequency** with 3.7 dBm output power. An injection locking bandwidth of ... A 22.8 GHz analog **frequency** divide-by-3 circuit is presented based on an injection locked **oscillator**. Substrate integrated waveguide (SIW) technology is used to implement the input and output sections of the **frequency** divider circuit. The input SIW section at the gate of the active device permits the introduction of the injection signal at the third harmonic **frequency** of the **oscillator**, while the output section is designed to maximize the DC-RF conversion efficiency of the **oscillator** circuit. A prototype is fabricated presenting a measured DC-RF efficiency of 38.5% at 7.603 GHz output **frequency** with 3.7 dBm output power. An injection locking bandwidth of 301.4 MHz was obtained for a 1.5 dBm input injection signal at 22.8 GHz.

Files:

Contributors: Qasem M. Al-Mdallal

Date: 2012-04-25

**oscillation**
amplitudes....**oscillation** was fixed to
the vortex shedding **frequency** from a fixed cylinder...**oscillations** were varied from to 1.1a, where a
represents the radius of...**oscillating** circular cylinder at
Reynolds number of 200. The **frequency**...**oscillation**; transverse
**oscillation**; fluid forces ... This paper presents results obtained from the
numerical solution for the flow past an **oscillating** circular cylinder at
Reynolds number of 200. The **frequency** of **oscillation** was fixed to
the vortex shedding **frequency** from a fixed cylinder, f0, while the
amplitudes of **oscillations** were varied from to 1.1a, where a
represents the radius of the cylinder. The response of the flow
through the fluid forces acting on the surface of the cylinder are
investigated. The lock-on phenomenon is captured at low **oscillation**
amplitudes.

Files:

Contributors: Meng Hu, Lili Wang

Date: 2012-08-26

**frequency** formulation...**oscillator** with fractional potential. By calculation and computer simulations...**frequency** formulation is used to obtain a periodic solution for a nonlinear...**oscillator** ... In this paper, He-s amplitude **frequency** formulation is used to obtain a periodic solution for a nonlinear **oscillator** with fractional potential. By calculation and computer simulations, compared with the exact solution shows that the result obtained is of high accuracy.

Files:

Contributors: Mohammad Taghi Darvishi, Samad Kheybari

Date: 2011-08-28

**frequencies** of the system. In parameter-expansion method the solution ...**frequency** of **oscillation** are expanded in a series by a bookkeeping parameter...**oscillator**....**oscillator** coupled gyroscopically to a linear **oscillator**. The major problem...**frequency** of **oscillation**. One iteration step provides an approximate solution ... In this article, we are dealing with a model consisting of a classical Van der Pol **oscillator** coupled gyroscopically to a linear **oscillator**. The major problem is analyzed. The regular dynamics of the system is considered using analytical methods. In this case, we provide an approximate solution for this system using parameter-expansion method. Also, we find approximate values for **frequencies** of the system. In parameter-expansion method the solution and unknown **frequency** of **oscillation** are expanded in a series by a bookkeeping parameter. By imposing the non-secularity condition at each order in the expansion the method provides different approximations to both the solution and the **frequency** of **oscillation**. One iteration step provides an approximate solution which is valid for the whole solution domain.

Files: