Measuring weight needs a scale; measuring a room needs a tape measure. But some things are much harder to measure: tiny density variations underground, extremely weak laser echoes from kilometers away, or locking light's frequency to extreme stability. Quantum precision measurement exploits the fact that quantum states are exquisitely sensitive to physical quantities, allowing these "hard to measure" things to be measured more accurately.
QuantumCTek's official website lists this direction as a dedicated product category, with four main public entries: cold-atom gravimeters, miniaturized long-range single-photon imaging, non-line-of-sight imaging, and femtosecond laser frequency combs. The company profile also notes that cold-atom gravimeters and single-photon detectors are being gradually rolled out as new growth drivers.
Cold-Atom Gravimeter A-Grav: "Weighing" Gravity with Atom Clouds
Imagine a cloud of ultra-cold atoms in free fall: lasers split and recombine the atomic matter waves, and the gravity acceleration is encoded in the phase shift. A-Grav is an absolute gravimeter built on this principle, with fully independent intellectual property per the official site.
The device consists of a sensing unit and a control unit: the probe senses gravity, while the control unit provides optoelectronics, timing, and data processing. Features include no moving mechanical parts, modularity, and support for both fixed-point and mobile surveys. Official application scenarios: geological hazard monitoring, geodetic surveying, resource exploration, buried-object detection, gravity-aided navigation, plus gravity referencing, drift-free continuous monitoring, and mobile surveying.
Official specifications (quiet station environment): short-term sensitivity better than 20 μGal/√Hz; accuracy and precision both better than 5 μGal; resolution 1 μGal; repeatability standard deviation better than 5 μGal. The optoelectronic system is roughly 52×46×53 cm³ and 45 kg; the probe is 30 cm in diameter, 70 cm tall, and 45 kg; steady-state power consumption is about 200 W. (1 μGal = 10⁻⁸ m/s²)
Single-Photon Imaging: Imaging When the Echo Is Down to Single Photons
Traditional lidar typically extends range by increasing laser power or telescope aperture. QuantumCTek's miniaturized long-range single-photon imaging combines single-photon detection with lidar: it responds to echoes as weak as single photons and records their arrival times to obtain 3D information.
Official spec summary: laser wavelength 1550±1 nm; InGaAs single-photon detector; image resolution 128×128; range resolution better than 12 cm; typical maximum detection range 15 km; overall unit roughly 300×250×200 mm and ≤15 kg. Typical applications: infrastructure monitoring, long-range target imaging, and low-altitude target detection.
The same category also includes non-line-of-sight imaging: the public description is similar to single-photon imaging, emphasizing near-infrared single-photon sensitivity, picosecond time-of-flight measurement, and a compact, movable form factor. The official site offers limited public specs for this entry, so no numbers are invented here.
Femtosecond Laser Frequency Comb FC1550-200-OPS: Turning Optical Frequencies into a "Ruler"
Light's frequency is extremely high and hard to measure directly. A frequency comb acts like an ultra-fine ruler, slicing the spectrum into equally spaced "teeth," enabling spectroscopy, microwave sources, optical clock comparison, and metrology transfer.
Official description of the FC1550-200-OPS: fully polarization-maintaining, highly integrated, domestically produced core components, one-button startup; the oscillator uses Figure-9 mode locking; it can lock to RF or optical references; multiple polarization-maintaining fiber outputs, with the spectrum extendable from roughly 1260 nm to 1630 nm.
Public parameters include: comb spacing 200 MHz; base-unit center wavelength 1560 nm; comb tooth linewidth <1 Hz; RF reference accuracy ≤1×10⁻¹³ @100s, among others (see the product-page table for details). Applications: high-resolution spectroscopy, ultra-low-noise microwave sources, optical clock frequency measurement and transfer, astronomy and space science.
Who Should Look Where, and How to Read the Official Site
- Surveying, geology, resource exploration: start with the A-Grav
- Security and long-range 3D infrastructure sensing: start with single-photon imaging
- Metrology institutes, spectroscopy, and time-frequency labs: start with the frequency comb
One Takeaway
On QuantumCTek's side, quantum sensitivity is being turned into portable, connectable instruments: cold-atom interferometry for gravity, single-photon echoes for seeing far, and optical combs for frequency. When it comes to numbers, trust only the tables on the official product pages.