Quantum XChange
A firm selling network-layer quantum-safe key delivery, with Phio TX as its named product.
Why this is listed
Its stated business is upgrading existing networks to quantum-safe encryption, delivered through one named product, so there is no broader practice for that work to sit inside.
- NIST-standardised algorithms
- The site names one or more of the algorithms NIST has standardised, such as ML-KEM, ML-DSA or SLH-DSA, or the FIPS numbers that specify them.
- Quantum key distribution
- The offering involves QKD, which distributes keys using physical hardware. It is a different approach from post-quantum cryptography, which is software running on the machines you already have.
Recorded from this subject’s own site, listed under Sources below.
Quantum XChange states that it upgrades existing network infrastructure to quantum-safe encryption, and names Phio TX as the product that does it. Its site states that the company is based in Bethesda, Maryland.
The site uses post-quantum cryptography and quantum-safe encryption interchangeably for the same product. Where a firm's vocabulary is its own, this entry keeps it rather than translating it into ours, and a reader comparing two entries here should expect the words to shift between them for that reason. The site also carries a claim about the company's position in its market, which this directory does not repeat for any entry.
Sources
Checked against these sources on Sep 4, 2026. Listing is not endorsement, and nothing here is ranked or scored.