QiB0: Four qubits for validating your setup.
Four fixed-frequency transmons and two bare resonators in a copper box with two SMA ports. The simplest way to check that your cryostat and measurement chain can see a good qubit.
- SMA case · Gold-plated oxygen-free copper
- 2 × Female SMA
- M3 mounting holes, to the coldest plate
Average T1
90–130 µs
Up to 256 µs · datasheet v2.0, Oct 2025
- Qubits
- 4 fixed-frequency
- Lines you need
- 1 in, 1 out
- Package
- Gold-plated copper, 2 × SMA
Specifications
From the QiB0 datasheet v2.0. Meas. marks a value measured on a device.
QiB0 specifications
CS_QIB0_30- Qubits
- 4 fixed-frequency transmons, 3–5 GHz, each with its own readout resonator
- Bare resonators
- 2, Qi ≳1×106 at single-photon power
- Measured
- T1
- 90–130 µs average; up to 256 µs
- Measured
- Package
- Gold-plated oxygen-free copper, 2 female SMA
- Operating temperature
- Below 50 mK
- Reference device
- CS_QIB0_30 — T1 138 / 121 / 132 / 109 µs
- Measured
Reference device
Datasheets show a measured reference device. Individual characterisation on request.
All elements
| Element | fq GHz | fr GHz | T1 avg µs |
|---|---|---|---|
| Q1Fixed qubit | 3.34 | 5.49 | 138 |
| Q2Fixed qubit | 3.49 | 5.63 | 121 |
| Q3Fixed qubit | 3.54 | 5.78 | 132 |
| Q4Fixed qubit | 3.41 | 5.94 | 109 |
| R1Bare resonator | – | 6.72 | – |
| R2Bare resonator | – | 6.91 | – |
Readout resonator fr is the dressed-state frequency.
What you can do with it
Benchmark a new cryostat or wiring change against a known device
Calibrate readout and attenuation chains
Demonstrate decoherence and qubit state initialisation in a course
Installation
Mount with two M3 screws to the coldest plate (4 mm thread depth). Connect one SMA to the input line, one to the output; 0.3–0.6 N·m. For best coherence, put the device in a dedicated thermal and infrared shield inside a magnetic shield.
- Lines you need
- 1 in, 1 out
- Connectors
- 2 × Female SMA
- Temperature
- Below 50 mK
- Shielding
- Thermal + infrared shield inside a magnetic shield
Used by the people who build cryostats
- QiB0
Bluefors and QphoX
Used QiB0 to compare optical–microwave conversion with microwave control of a transmon.
- QiB0
Kiutra
Used QiB0 to show how to optimise qubit performance in their L-Type Rapid cryostat.
Application note
The Qubit-in-a-Box family
Compare all three- QiB0This page
Four qubits for validating your setup.
- Qubits
- 4 fixed-frequency
- T1
- 90–130 µs avg, up to 256 µs
- Package
- Gold-plated copper, 2 × SMA
- QiB1
Six qubits, three levels of control.
- Qubits
- 6: fixed and tunable, two transmon styles
- T1
- Reference device 56–151 µs
- Package
- Box20, 20 × SMPM
- QiB2
Two ways to couple qubits, on one chip.
- Qubits
- 7: two coupled pairs + 3 single
- T1
- Up to 140 µs avg, up to 223 µs
- Package
- Box20, 20 × SMPM
Ordering
- Price
- from €8,900
- Lead time
- 6–8 weeks
- North America
- Order through our distributor, Quantum Microwave.
Datasheet
Shipping and export control
Our quantum devices are EU dual-use items (category 3A001). Every order needs a signed End-User Statement before shipping. Within the EU, and to Australia, Canada, Iceland, Japan, Liechtenstein, New Zealand, Norway, Switzerland, the UK and the US, no individual licence is needed. Anywhere else needs an export licence, which adds time, so tell us your destination early and we'll start the paperwork with you.