Quantum Random Number Generators: True Randomness You Can Check
Why randomness is a big deal
Every secure connection depends on secret keys, and secret keys depend on randomness. If an attacker can guess your random numbers, the best cipher in the world will not save you. Ordinary computers use "pseudo random" generators: formulas that look random but follow rules, usually seeded from physical noise. Most are fine when engineered well. A quantum source offers randomness that is unpredictable in principle, because quantum measurement outcomes are not fixed in advance.
A QRNG in your pocket
This is the one corner of quantum technology you can already hold. Samsung sold a Galaxy A Quantum in 2020 and a Galaxy Quantum 5 later, reportedly only in South Korea, using a small chip from ID Quantique. Press reports describe an LED shining on an image sensor: the natural fluctuation in the number of photons, known as shot noise, supplies the randomness. The numbers feed security functions such as login, authentication and key generation. Reporting stresses that this chip is only a random number source, not a quantum computer, and its benefits are mainly described by the vendors, so I cannot say how much it improves real world security.
The trust problem
How would you know a box is really producing quantum randomness and not something rigged or drifting? You usually cannot, without trusting the manufacturer. Physicists have a cleverer answer: use a Bell test. In a Bell test, measurements on entangled particles show correlations that no pre-arranged classical story can reproduce. If the test is passed, the outcomes must contain genuine randomness, almost regardless of how the device was built. This is the idea behind "device independent" or certified randomness. For background see entanglement explained.
NIST and CU Boulder: CURBy
In June 2025, a team led by NIST with the University of Colorado Boulder published in Nature a service called CURBy, the Colorado University Randomness Beacon. According to The Quantum Insider's summary of the release:
- A special crystal makes pairs of entangled photons, sent by optical fiber to labs at opposite ends of a hall, where their polarizations are measured about 250,000 times per second.
- The measurements violate the classical limit, which is how the randomness is certified.
- A program turns millions of measurements into 512 random bits per run.
- A protocol called Twine hashes each data set into a traceable structure so anyone can check the steps and spot tampering.
- In its first 40 days it succeeded 7,434 times out of 7,454 attempts, about 99.7 percent.
Proposed uses include choosing jury candidates, selecting audit samples and running public lotteries. NIST describes it as the first randomness service to use quantum nonlocality as a source. Note that the "provable quantum advantage" language comes from NIST's own researcher, and the summary I read offers little independent assessment. About 0.3 percent of runs failed, so output is not guaranteed on a fixed schedule.
Randomness is not encryption
A QRNG supplies raw ingredients. The cipher, the protocol and the key storage still matter. It also does nothing against a future quantum computer breaking public key math. That job belongs to post-quantum cryptography (see QKD vs PQC). A good QRNG plus PQC is a sensible combination, and an easier one to deploy than QKD because it is a self contained component rather than a whole network.
QRNG, QKD and PQC at a glance
| Technology | What it does | Needs a network? |
|---|---|---|
| QRNG | Makes unpredictable numbers | No, can be a chip |
| QKD | Shares keys using photons | Yes, special links |
| PQC | New math for encryption and signatures | No, software only |
A note for crypto fans
Blockchains and wallets need good randomness to create keys. Nothing here means a QRNG makes a token safer or more valuable. See storing QNT safely for sensible habits. This is education only, not financial advice, and QNT is an independent community token, not linked to NIST, ID Quantique, Samsung or any lab.
Why this is a hopeful corner
QRNGs show quantum technology doing a useful job right now, in a form you can verify. Public beacons like CURBy also hint at what a future quantum internet might offer: services built on entanglement that anyone can audit.
Sources and further reading
- The Quantum Insider: NIST CURBy randomness beacon
- Security Boulevard: NIST CURBy
- The Quantum Insider: Samsung and ID Quantique QRNG phone
- PhoneArena: Galaxy Quantum 5
Reported as of 2026-10-09. Quantum networking results are mostly lab or pilot demonstrations, and schedules slip. Check the primary papers and agency pages before relying on any figure. Nothing here is financial advice. QNT is an independent community memecoin and is not linked to Quantinuum Ltd or any lab, company or government.
Frequently asked questions
Is a quantum random number generator a quantum computer?
No. It is a small device that uses a quantum process, such as photon noise, as a source of random bits.
What is CURBy?
A public randomness beacon run by NIST and CU Boulder that reportedly uses entangled photon Bell tests to certify its random numbers, published in Nature in June 2025.
Does a QRNG protect against quantum computers?
No. It improves the quality of keys, but stopping quantum attacks on public key math needs post-quantum cryptography.
Is this financial advice?
No. This is education only, and QNT is not linked to any lab or company.
Keep reading
- Quantum Key Distribution (QKD) Explained vs Post-Quantum Cryptography
QKD uses quantum physics to share encryption keys. Learn how it works, its limits, and how it differs from post-quantum cryptography. - QKD vs Post-Quantum Cryptography: Why Agencies Prefer Math
Two ways to defend against future quantum computers, one built on physics and one on new math, and why the NSA and the UK NCSC back the math. - Quantum Entanglement Explained Simply
Entanglement links qubits so they share a joint state. Learn what it is, what it is not, and why quantum computers use it. - The NIST Post-Quantum Process Explained
How NIST ran its multi-year post-quantum cryptography competition, from public call to the first standards in 2024, and what work is still continuing.
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