QFilter-II is your compact solution for advanced multi-stage low-pass filtering. It’s specifically designed to reject noise and maintain millikelvin electron temperatures across 24 signal lines. This makes it an ideal fit for your quantum electronics devices and other sensitive cryogenic circuits. Originating from extensive research at Harvard University and the University of Copenhagen, QFilter is now a trusted tool in over 100 research groups worldwide.
At millikelvin temperatures, ensuring cold electrons in signal lines is a challenge. QFilter-II addresses this by cooling electrons and filtering out electrical noise ranging from about 65 kHz to tens of GHz. Constructed from gold-coated high-conductivity copper and mountable on your cryostat’s mixing chamber plate, it is a key component for any cryogenic setup.
Our standard configuration offers two filtering banks (low-frequency and radio frequency) with 25-pin micro-D connectors. These banks are connected in series using a shielded jumper cable. The compact, non-magnetic design allows for direct mounting on the mixing chamber plate, compatible with most fridge manufacturers such as Bluefors fridges and the Oxford Instrument Proteox shown below.
QFilter-II features two low-pass filtering banks in series: a low-frequency (65 kHz) filter with RC circuits and a high-frequency (RF, 225 MHz) filter with LC circuits. Each bank is crafted with several individually shielded filter stages. Signal lines support 150V voltages (below 4 Kelvin, max. 6mA for RC, 10mA for RF) and provide >10GΩ isolation below 4K to ground and other lines. Individual low-frequency filter lines can be shortened upon request, allowing for higher signal currents e.g. used for current biasing flux-lines.
For systems requiring more than 24 lines, QFilters can be efficiently stacked (top image) saving space on the mixing chamber plate or connected in series (bottom image) removing the need for jumper cables. This flexibility allows for configurations like dual RC or dual RF filters, catering to diverse setup requirements.
QFilter effectively reduces electron temperatures to typically 5-15 mK above the mixing chamber, ideal for sensitive experiments.
QFilter including both low frequency and RF filters transmits below 65 kHz and attenuates from 10 MHz to 20 GHz by more than -60dB.
Designed with non-magnetic, shielded components, QFilter excels in high magnetic fields, offering dependable performance.
Adaptable for filtering 48, 96, or more lines, QFilter’s scalable design meets the demands of growing research projects.
Electron Thermometry
Low-temperature benchmarking of qubit control wires by primary electron thermometry
QFilter-II: Compact Multi-Stage Low-Pass Filter
Feedback-Driven Quantum Stabilization: Two-Axis Real-Time Control of Spin Qubits
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“QM’s chip packaging solutions are exquisite pieces of engineering that have enhanced our resonator Q-factors to as much as 200 million. It is clearly a very highly engineered product that I’m sure will be widely adopted in the field.”
“We were extremely surprised by the flexibility that OPX offers and by how much easier it makes our experiments. Moreover, OPX provides extreme speed-ups. No more frustration due to long waiting times for unwanted results!”
”QM's control electronics provide the best real-time features along with an intuitive and well-documented programming interface. At TII, we successfully controlled a 25-q chip and conducted multiplexed characterization of all qubits using QM’s OPX and Octave. What we appreciate most, however, is the QM’s unwavering support and commitment to helping us achieve our targets, even going so far as to send some of their best scientists when needed.”
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“QM's chip packaging solutions are exquisite pieces of engineering that have enhanced our resonator Q-factors to as much as 200 million. It is clearly a very highly engineered product that I am sure will be widely adopted in our field.”
“Developing a functional qubit control electronic system absorbs a PhD-student full time at least for two years. QM’S Quantum Orchestration Platform allowed us set up experiments for full qubit characterization in 2-3 days with an undergraduate summer school student.”
“We are very pleased with the Quantum Orchestration Platform (QOP) control solution. It’s remarkably easy to use, reliable, and flexible, supporting our advanced quantum research needs. The QOP dramatically expedites our research. The Quantum Machines customer success team has been instrumental in addressing all our needs to help us to maximize the full potential of the solution. We already use two systems and strongly recommend it.”
“The quantum orchestration platform (QOP) platform completely changed the way we control semiconductor quantum dot spin qubits. Key qubit control schemes we previously developed individually using time-consuming hardware description languages are now easily implemented in one box.”
“Replacing three devices with one synchronized, orchestrated machine tremendously simplified lab workflow. Now our pulse sequences run in a fraction of the time of any other device combo. Plus, we can “talk” to the FPGA in human-speak, to run real-time calculations that were too complicated before! Along with the yoga-level.”
“The first time I was introduced to Quantum Machines, It surprised me how people were getting so excited about it. Only later did I realize, it was like explaining the value of a Laser before it existed, and all you knew are light bulbs. Today I truly believe that these systems will revolutionize our space.”
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