Crescendo-S is the best commercially available Josephson travelling wave parametric amplifier (J-TWPA), capable of elevating qubit readout towards the state of the art in quantum computers of all sizes. It features cutting-edge gain and noise performance over a wide readout band to enable highly multiplexed and cost-effective readout. Designed to be flexible, scalable and easy to use, Crescendo-S is the readout amplifier for your application.
OPTIMISED FOR MULTIPLEXED READOUT
Achieving cutting-edge gain and noise performance over a wide 1 GHz readout bandwidth, Crescendo-S enables the multiplexed readout of many qubits at once. This enormous reduction in the required overhead in terms of wiring complexity, up-chain components and cost per qubit compared to traditional narrow-band JPA-based readout solutions facilitates future-proof scalable qubit readout.
When you are building a quantum computer, readout amplification should be the least of your concerns. Therefore, Crescendo-S is designed from the ground up with ease-of-use in mind. The current-pumped design is intrinsically simple to tune-up and requires minimal peripheral electronics. Combined with the device-specific characterisation report and expert support included with every device, it is easy to use for experienced and beginning researchers alike.
Easy to setup and use
When you are building a quantum computer, readout amplification should be the least of your concerns. Therefore, Crescendo-S is designed from the ground up with ease-of-use in mind. The current-pumped design is intrinsically simple to tune-up and requires minimal peripheral electronics. Combined with the device-specific characterisation report and expert support included with every device, it is easy to use for experienced and beginning researchers alike.
Compact and Highly Scalable
Scalability of readout solutions is paramount to reaching quantum advantage. Crescendo-S is designed and produced to keep pace with even the most ambitious scaling roadmaps. With a compact factor, high-density packaging and highly-automated production process, Crescendo-S is your path to state-of-the-art readout at scale.
READY TO COMPLEMENT YOUR SETUP
Crescendo-S is a versatile amplifier compatible with a wide range of qubit types and available in 1 GHz readout bands between 4 and 9 GHz. Paired with its optional cryo-holder it is ready to go into your fridge straight out of the box.
WHAT IS A TWPA?
In superconducting quantum computing, Dispersion-Engineered Josephson Travelling Wave Parametric Amplifiers (J-TWPA) play a pivotal role in reading out qubit states. These states are stored in low-power radio frequency (RF) excitations. During readout, equally weak readout pulses are used which would drown in thermal noise at higher temperatures stages without proper amplification.
To achieve fast and high-fidelity readout of the qubit state, ultra-low-noise amplification is required close to the qubit at cryogenic temperatures. The J-TWPA stands as the state-of-the-art solution for this task.
J-TWPAs comprise a long chain of Josephson elements that facilitate a nonlinear wave mixing process which transfers power from a strong pump tone to the low-power signal. By carefully engineering its dispersion properties, this J-TWPA exponentially amplifies the readout signal along its length while adding close to the fundamental lower limit of added noise that results from Heisenberg uncertainty.
Contrary to Josephson Parametric Amplifiers (JPAs), J-TWPAs are transmissive rather than resonant devices, granting them a broad bandwidth unconstrained by resonator limitations. This enables the high degree of frequency multiplexing within a single readout chain that is paramount to scaling quantum computers towards advantage.
J-TWPAs comprise a long chain of Josephson elements that facilitate a nonlinear wave mixing process which transfers power from a strong pump tone to the low-power signal. By carefully engineering its dispersion properties, this J-TWPA exponentially amplifies the readout signal along its length while adding close to the fundamental lower limit of added noise that results from Heisenberg uncertainty.
Contrary to Josephson Parametric Amplifiers (JPAs), J-TWPAs are transmissive rather than resonant devices, granting them a broad bandwidth unconstrained by resonator limitations. This enables the high degree of frequency multiplexing within a single readout chain that is paramount to scaling quantum computers towards advantage.
SETUP REQUIREMENTS
To operate Crescendo-S, you will require a pump source (preferably CW), isolators, and a directional coupler for each TWPA. We recommend using wide-band (4-12 GHz) isolators and couplers for optimal performance. During installation, you will also require ESD-protection gear, a torque-limiting wrench and a 50 Ω load for discharging SMA-cables.
Contact us today for more details.
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