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Quantum Mechanics (QM) is a completely new description of the universe comparing to classical physics, which was proposed and researched since early 20th century. Different from the conventional theories, the QM indicates that the microscopic world follows the principle of probability, which means the observables of a micro-particle, photon for example, can have two values, with a certain probability.

From the basic principle of QM, several fundamental laws can be derived:
1. No-Cloning Theorem
 It is impossible to create an identical copy of an arbitrary unknown quantum state.
2. Wave function collapse
 The measurement process will introduce a collapse to the wavefunction of a particle, unless the measurement basis happens to be the eigenstate of the quantum state.
3. Heisenberg's uncertainty principle
  Any pair of non-commuting self-adjoint operators representing observables are subject to uncertainty limits, which means these two observables cannot be pricisely measured at the same time.

Quantum inforamtion is a booming research field that ultilize the singular characteristics of QM for secrete information transmission as well as the information processing.
The quantum key distribution (QKD), is an important branch of the quantum information research. Together with the one time pad theory, the only crystallographic scheme whose security has been theoretically proved so far, QKD provides an unconditional secure way to share secrete keys among remote users.

The first QKD protocol, Bennet-Brassard 1984 (BB84) is an simple and clear example. Wiki_en, Wiki_cn.

We are working on safer, faster, and more robust QKD protocols and systems for practical use.

If you are interested please contact us!
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"Video of a day in the Future" by NICT, Tokyo, Japan (Youtube,Weibo)