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Speeding up NV Center Measurements with Real-time Control

21.08.2023

Experiment conceptual diagram

Real-time feedback control can often speed up quantum experiments, increase fidelity, or enable new methods. One example is adaptive sensing and characterization, which uses feedback to minimize the number of measurements needed to estimate a given quantity. Our customers in the group of Prof. Cristian Bonato at Heriot-Watt University (Edinburgh, Scotland) have recently demonstrated this method on an NV-center based spin qubit and achieved an increase in speed by up to an order of magnitude compared to non-adaptive approaches in the estimation of qubit decoherence timescales.

Accurate Impedance Measurements Despite High Parasitic Resistance

13.07.2023

MFIA with two MFITFs to simulate a high-resistance measurement path

This blog post takes a look at impedance measurements in the presence of a high parasitic resistance, and shows that you can accurately measure small impedance DUTs even in the presence of a high in-series resistance such as with an unavoidable resistance in the measurement fixture, cables or sample stage. We show that thanks to the high dynamic reserve of the MFIA (and MFLI with MF-IA option), coupled with the user compensation feature, accurate impedance measurements can be taken even in the presence of a high in-series resistance such as 1 MΩ.

Quantum Materials: from Characterization to Resonator Measurements - Q&A

26.06.2023

QT Webinar Physic Today

In this webinar, we discussed transport measurements on materials for quantum computing, why studying resonators accelerates development of materials used for quantum computing by yielding a wealth of information, and how to measure resonators effectively with the Pound-Drever-Hall method. The recording of the full webinar can be found here...

Setting Up the UHFLI Boxcar Averager for Pulsed Laser Experiments

21.06.2023

teaser

Boxcar averagers (sometimes also known with the name of “gated integrators”) are instruments used to measure signals stemming from low-duty-cycle experiments. The information contained in low-duty-cycle pulsed signals is concentrated within a short time duration; thus, the idea behind the boxcar averager is to record the signal only during the...

Detecting Covid Virus Using an MFIA Impedance Analyzer

14.06.2023

MFIA

In the past few years, the spread of COVID-19 pandemic has led to a tremendous development in detecting SARS-CoV-2 (and HCoV-229E) viruses. Whereas polymerase chain reaction-based fluorescence is known to be accurate, it is time-consuming and requires sophisticated setup and expertise. On the other hand, lateral flow assay (LFA) is...

Piezoelectric Impedance: Measurement and Modeling

13.04.2023

teaser piezo

Piezoelectric materials can produce electricity under mechanical stresses, and often find uses in both sensing and transducing applications. In this blog post, we focus on the electrical impedance measurement of piezoelectric materials, using an MFIA Impedance Analyzer (measuring the electrical response of piezoelectric devices often requires a charge integrator, which...

Setting Up Drive Level Capacitance Profiling Measurements

14.03.2023

DLCP

Drive level capacitance profiling (DLCP) is a powerful technique to accurately determine the charge carrier density in semiconductors when deep level states are present. It is often considered an improvement over the widely applied characterization technique known as capacitance-voltage (C-V) profiling...

Electrochemical Impedance Spectroscopy Beyond 300 GΩ

19.01.2023

MFIA Impedance Analyzer

In electrochemistry, the characteristics of a given process can be assessed by electrochemical impedance spectroscopy (EIS). A semicircle in the Nyquist plot usually corresponds to electrochemical processes that can be modelled as a parallel connection of a resistor (R) and a capacitor (C). The diameter of the semicircle provides the value of R, while the associated time constant (also known as relaxation time) is given by RC...

Impedance Measurements on Grounded Components

09.01.2023

Setup for measuring grounded components with the MFIA

The MFIA is a high-precision impedance analyzer. It measures voltage, current and phase to calculate impedance. As is the case for most impedance analyzers, the measurement circuit is designed so that the device under test (DUT) is operated under floating conditions, which means that none of the terminals of the DUT is connected to the ground...

Dielectric Impedance Measurements of Chocolates

19.12.2022

winter card

Swiss chocolates are famous worldwide thanks to their high quality of taste. Switzerland is also renowned as the country with the highest chocolate consumption per capita. Today, many popular brands can be found even in the supermarket. Are you curious about what makes the chocolates special? And which non-destructive technique (NDT) can be employed to measure them?

Hands-on Superconducting Qubit Characterization

25.11.2022

This blog post accompanies the webinar "Superconducting Qubit Characterization", which introduced the basic physics of transmon qubits as well as the tools and methods required to tune them up. The webinar included a live Q&A session, but due to time constraints, not all of the viewers' questions could be answered within the duration of the session. Below, we address the technical questions asked during the webinar...

Subsampling Techniques for Achieving Waveform Precision in Picoseconds

11.11.2022

Oscilloscope image HDAWG subsampling

An arbitrary waveform generator (AWG) can generate pulses with a timing resolution much finer than its sampling period. Users are often unaware of this capability, yet it enables highly precise timing control in application use cases such as NV center dynamical decoupling, flux pulse width control, AWG channel deskew, and IQ mixer calibration...

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