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QSS (Quantum Science Satellite) or Mozi, also known as QUESS (Quantum Experiments at Space Scale), is a Chinese minisatellite to establish a space platform with long-distance satellite and ground quantum channel, and to carry out a series of tests about fundamental quantum principles and protocols in space-based large scale.

The scientific goals are to implement a series of science missions between Quantum Science Satellite and quantum communication ground stations. The major tasks are as follows:

  • Quantum Key Distribution from Satellite to Ground
    To set up an ultra-long-range quantum channel between ground and satellite with the assistance of high-precision acquisition, tracking and pointing system, implement a quantum key distribution between the satellite and the ground stations, and carry out unconditional secure quantum communication experiments.
  • Global Scale Quantum Communication Network
    To set up a real wide-area network for quantum communication using the satellite repeater and two arbitrary quantum ground stations and their auxiliary local-area fiber quantum networks.
  • Quantum Entanglement Distribution from Satellite to two ground stations
    Distribution of quantum entangled photons from the satellite to two distant ground stations whose distance is larger than one thousand kilometers; test of the entanglement properties at a large scale and nonlocality of quantum mechanics.
  • Quantum Teleportation from Ground to Satellite
    as a totally new way of communication, quantum teleportation is the fundamental process of quantum networks and quantum computing. A high quality quantum entanglement source on the ground will be built to achieve ground-to-satellite teleportation experiments based on photon entanglement.

QSS was launched in Augus 2016 on a CZ-2D (2) rocket.

Nation: China
Type / Application: Science
Operator: Chinese Academy of Sciences (CAS)
Contractors: CAS (prime)
Propulsion: ?
Power: 2 deployable solar arrays, batteries
Lifetime: 2 years
Mass: ~ 500 kg
Orbit: 488 km × 584 km, 97.4
Satellite COSPAR Date LS Launch Vehicle Remarks
QSS (QUESS, Mozi) 2016-051A 15.08.2016 Jq SLS-2 CZ-2D (2) with Lixing 1, 3Cat 2