Quantum communications
Quantum-secure keys over the networks you already run.
Quantum key distribution for fibre and free-space links: CV-QKD on the fibre you already have, DV-QKD reception at the ground station.
Why now
Intercept today. Decrypt tomorrow.
Harvest now, decrypt later is already under way: encrypted traffic captured today and held until a quantum computer can break it. For data that must stay confidential for decades, the threat is not in the future.
The key exchange that protects most of today’s traffic is vulnerable to Shor’s algorithm at sufficient scale.
State secrets, medical records and intellectual property must remain confidential beyond any plausible quantum horizon.
Keys whose secrecy rests on physics and a security proof, not on the adversary’s computing power: to intercept is to disturb, and disturbance is detectable.
How it works
How light becomes a key
Quantum state transmission
The transmitter encodes random information in Gaussian-modulated coherent states of light and sends them over the quantum channel: fibre or free space.
Measurement
The receiver measures both quadratures of the incoming states by heterodyne coherent detection. A third party cannot measure without adding noise the receiver sees.
Classical post‑processing
Over an authenticated classical channel, both parties estimate the information leaked, then run error correction and privacy amplification.
Shared secret key
Secret under a composable security proof. Used to refresh AES-256 keys, or as a one-time pad (OTP) for low-rate data.
Fibre and free space
One principle, two channels.
QKD over the fibre you already have.
Our continuous-variable QKD (CV-QKD) systems run over standard single-mode fibre at 1550 nm, designed to share fibre with classical channels through dense wavelength-division multiplexing (DWDM).
Bridging orbit and network.
Optical satellite-to-ground links are the scalable route to intercontinental QKD, with the satellite replacing long chains of ground relay nodes. We build the discrete-variable QKD (DV-QKD) reception hardware for optical ground stations (OGS).
Solutions
Hardware for both channels.
ALICE Tx · BOB Rx · 19″ rack · 3U
CV-QKD system
ALICE Tx and BOB Rx units for point-to-point links over standard single-mode fibre, with a built-in Key Management System (KMS).
DEOM · OGS Quantum Stack
OGS Quantum Stack
QKD demodulator (DEOM) and control unit (DCU) for DV-QKD reception at optical ground stations (OGS).