The only truly safe encryption is quantum encryption. Any classical encryption algorithm should be breakable with quantum computers, even if we haven’t figured it out yet like with Shor’s.
“It's been estimated that 6,681 qubits would be required to run use Grover's algorithm to break AES-256 bit encryption.”
https://www.theregister.co.uk/2019/03/14/quantum_encryption_...
Even if you don’t go that extreme, there’s no indication that e.g. AES is breakable.
Though the concept seems nice, it has quite a few issues in practice. Such as distance between coupled devices, and the need to have a dedicated physical communication line.
Oh and before you think you can just chain several devices to get longer distances: this opens you up to classical MitM attacks.