Company Blog

Stable Synchronization over 52 Meters and 14 Days

23.08.2023

Airbus wingspan

The Zurich Instruments Quantum Computing Control System provides reliable and precise timing synchronization out of the box. But what does reliable synchronization really mean? Here, we show results from two experiments that put the synchronization stability to a hard test. First, we synchronize two SHFQC Qubit Controllers across 52 meters synchronization distance to conduct a photon pitch-and-catch experiment on a real quantum chip. Second, we assess the long-term stability of such long-distance synchronization links for a full 14-day period.

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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.

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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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Five Tips to Boost Your Qubit Measurements

07.06.2022

Speedup of QCCS

When operating qubits, speed and high system utilization are key to achieving rapid progress. In this blog post, you’ll find a collection of five important tips to optimize the throughput of your Zurich Instruments Quantum Computing Control System (QCCS) and perform measurements faster than ever!

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A Fast and Integrated Qubit Control System - SHFQC Launch Event

18.03.2022

SHFQC Launch Event

On March 3rd, Jan Benhelm, Bruno Küng and I were thrilled to welcome a diverse audience from all over the world to present our newest instrument - the SHFQC Qubit Controller. In the first part of the webinar Jan explained how the SHFQC integrates a full qubit control system for...

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Efficient Generation of Dynamic Pulses

08.09.2021

Rabi Cyclic

Solid-state qubits are typically characterized and operated by a series of very short pulses. To achieve a high-fidelity control, it is necessary to generate many sequences of them, with very accurate timing. In this blog post, I will show how to use the advanced feature set of the HDAWG Arbitrary...

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Bell-State Stabilization of Superconducting Qubits with Real-Time Feedback

18.08.2021

The surface code which consists of a two-dimensional array of qubits

Bell-state stabilization with real-time feedback is a key milestone for the implementation of surface code [1], which is one of the most promising quantum error correction codes for building large-scale quantum computers [2]. Fundamental requirements for realizing this code are high fidelity and rapid readout of qubits, high fidelity gate...

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Randomized Benchmarking in Seconds

20.05.2021

Random Benchmarking Sequence

Randomized benchmarking (RB) is a widely used tool in quantum information science to determine qubit fidelity and to characterize individual qubit gates. It is also an excellent example of a quantum experiment with advanced requirements on the control hardware and software. For an RB experiment, we apply random sequences of...

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Practical Active Qubit Reset

05.03.2021

Active Qubit Reset Setup

When working with qubits, it’s essential to have a reliable state preparation. The easiest method for superconducting qubits is to passively wait for the qubit to decay into its ground state, but it’s slow and has poor fidelity. Active qubit reset decreases considerably the initialization time, while greatly increasing the...

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Automating IQ Mixer Calibration on the HDIQ

03.02.2021

LO Leakage

As a crucial step in the bring-up of superconducting experiments, IQ mixer calibration normally requires multiple instruments from different parties and manual cabling work. This blog post describes how to use the Zurich Instruments HDIQ, HDAWG and UHFQA (or other UHF instruments) to automate IQ mixer calibration and: Simplify the...

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A Fast and Scalable Approach to Controlling 100 Qubits and More - Q&A

02.09.2020

100qubits

On August 20, we talked about our fast and scalable approach to controlling 100 qubits and more. The webinar was recorded and is available on demand here . In the first part of the webinar, we covered our fast approach and explained how to get a handle on the complexity...

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How to Generate QAM Signaling with the HDAWG

25.11.2019

QAM Signalling

Digital modulation is extensively used in telecommunications, radar systems and quantum technologies. Corresponding to every analog modulation technique, i.e., amplitude modulation (AM), phase modulation (PM) and frequency modulation (FM), there is a digital version of signal modulation...

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AWG Precompensation for High-Fidelity CZ Gates in Transmon Qubits

02.11.2019

Noise feature of HDAWG 5V range

High quantum gate fidelity is essential for all quantum hardware platforms. Temporal sensitivity to flux noise and flux pulse distortion can pose major limitations to achieving high fidelity with repeatable two-qubit gates in transmon qubits. In a recent publication, Rol and collaborators demonstrated a fast (40 ns), low-leakage (0.1%), high-fidelity...

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Are Your Parametric Two-Qubit Gates Limited by the Driving AWG?

13.09.2019

HDAWG Noise Floor

If you are using the Zurich Instruments HDAWG, the answer is no. Let's see why. Parametrically modulated superconducting qubit gates (parametric gates) are usually accomplished by RF-modulation – typically several hundred MHz – of the flux through a mediating coupler element or qubit. Usually, many dBm of signal power are...

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Generation of Single-Sideband Modulation by Arbitrary Waveform Generators

15.12.2017

SSB modulation Scheme

Introduction I/Q modulations are extensively used in a variety of applications including telecommunications, quantum computing (QC), nuclear magnetic resonance (NMR), electron paramagnetic resonance (EPR) spectroscopy and band-excitation atomic force microscopy (AFM). In this post, we demonstrate how to generate such signals using arbitrary waveform generators from Zurich Instruments with an...

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