Quantum technology

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Quantum technology

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Quantum technology mainly includes three major fields: quantum computing, quantum communication, and quantum precision measurement.

Atomic Cooling

Laser is one of the effective methods for cooling atoms. It uses scattering between photons and atoms to reduce the motion rate of the atoms, thus achieving the cooling effect. Laser cooling can obtain extremely low temperature. As a micro scale controllable multi-body system physics, ultracold atom have extremely low thermal noise, good coherence, flexible manipulation and high signal to noise ratio. They are widely used in many fields such as quantum precision measurement, quantum simulation, quantum computing, etc.

Not all atoms can be cooled down by the laser. Most of the atoms that can be cooled down now are alkali metal atoms (such as Rb and Cs) or alkaline earth group atoms (such as Ba and Sr). Since different kind of atoms have different resonance, the wavelength of the laser which used for capturing and cooling atoms must be suitable. The typical laser cooling wavelengths for several alkali metal and alkali earth metal atoms are listed below:

Rb 480nm, 532nm, 780nm, 795nm

Cs 509nm, 510nm, 852nm

Ba 456nm, 532nm

Sr 679nm, 689nm, 707nm，813nm

With its unique characteristics of narrow linewidth and low-noise, combined with the advantages of high beam quality, high integration and maintenance-free fiber system, single frequency fiber lasers have broad prospects in cold atomic physics, high-resolution spectral analysis, gravitational wave detection and long-distance coherent communication.

Quantum Communication

Quantum communication utilizes quantum superposition states or entanglement effects for information or secret key transmission. By adding quantum key distribution and information encryption transmission to classical communication, the network information security guarantee capability is greatly enhanced. In quantum communication, the photons carrying quantum information need to possess some special properties, such as the ability to maintain the stability of their quantum state and to be manipulated and detected precisely. Single frequency lasers can be used to generate quantum-state laser photons. They provide the pure optical signals required for quantum communication. The photons generated by single frequency lasers can meet the requirements for reliability and accuracy of information transmission in quantum communication.

In addition, single frequency lasers can generate quasi monochromatic and quasi coherent light waves. Their photon properties are consistent with the principles of quantum physics, providing a good foundation. Accordingly, single frequency laser plays an important role in quantum communication. It is also one of the key equipment for generating quantum state photons and transmitting quantum information. Connet offers single frequency fiber lasers based on eye-safe wavelengths for quantum communications, including 1.5 um and 2.0 um series.

Related Productions：

CoSF-D series 1.5μm Single Frequency Fiber Laser

CoSF-D series 2.0μm Single Frequency Fiber Laser

Quantum Computing

Quantum computing uses quantum bits as the basic unit, utilizing principles such as quantum superposition and interference to perform quantum parallelism. It can also provide exponential acceleration on specific computing difficult problems. Quantum entanglement is the core resource of quantum computation. The ability of quantum computing will exponentially increase with the number of entangled bits. Therefore, the synchronous preparation of high-quality entangled particle pairs is the primary condition for achieving large-scale entangled states. Benefiting from advances in atomic control technology, cold atoms have become an idealized platform for quantum simulation. The high controllability and scalability of cold atoms make it highly possible to achieve high bit quantum entanglement. Relying on the DFB single frequency fiber laser technology, Connet achieves the short wavelength single frequency laser outputs of 500~900nm through frequency conversion, which are the ideal light sources for atom cooling systems.

Related Products：

CoSF-FC series 509nm Single Frequency Fiber Laser

CoSF-FC series 532nm Single Frequency Fiber Laser

CoSF-FC series 679nm Single Frequency Fiber Laser

CoSF-FC series 689nm Single Frequency Fiber Laser

CoSF-FC series 707nm Single Frequency Fiber Laser

CoSF-FC series 780nm Single Frequency Fiber Laser

CoSF-FC series 795nm Single Frequency Fiber Laser

CoSF-FC series 813nm Single Frequency Fiber Laser

CoSF-FC series 852nm Single Frequency Fiber Laser

Quantum Measurement

Quantum precision measurement is one of the important applications of atom cooling. Due to the long de Broglie wavelength of cold atoms, they easily show the quantum properties, making them suitable as tools for precise quantum measurements. They also play an important role in precise timing, navigation, and ultra precision RF sensing.

Ultracold atom have a highly stable oscillation frequency, which provides an ideal basis for highly accurate atomic clock. Atomic light clocks are already playing an essential role in timing, navigation, and fundamental physics researches. Applications in the field of precision measurement based on cold atomic system also include: cold atomic fountain frequency standard, interferometer measurement of gravitational constants, magic wavelength optical lattice frequency standard, frequency cold ion standard, cold atomic gravimeter, cold atom gyroscopes, and other new types of precision measurement instruments for cold atoms. Based on the DFB single frequency fiber laser technology, Connet achieves the short wavelength single frequency laser outputs of 500~900nm through frequency conversion. They are the ideal light sources for cold atomic systems.