Now, it’s time for Coherence, the quantum executive summary, where I take a moment to highlight some of the business impacts we discussed today in case things got too nerdy at times. Let’s recap. Quantum networking allows for entanglement between qubits to be extended across great distances. Doing so has some significant technical challenges.
One of these is the no-cloning principle of quantum mechanics, which prevents an entangled state from simply being copied. Instead, we have to use entanglement swapping. For example, a qubit from a quantum computer — let’s call that point A — entangles with a qubit in a quantum repeater, point B. That repeater is an application-specific quantum computer of its own tasked with entanglement swapping. The repeater at point B will entangle with another repeater further down the fiber, or point C. This process continues until it reaches another quantum computer sensor, completing the circuit. This could allow a qubit from point A to entangle with, say, point J.
Quantum information is protected from eavesdropping by its, well, quantum nature. An observation made on such a network will destroy the state. We’re familiar with this principle from years of QKD research. However, like QKD, we know that denial-of-service attacks are a real possibility via flooding fiber with lasers, for example. Protecting against such attacks will represent the first type of security control needed in quantum networks and repeaters.
memQ is working on making these repeaters a reality on the Chicago network test bed within two to three years. They’re building the rare-earth silicon qubits that handle the swaps and quantum memory for the device. One day, protocols like interconnect can work with these systems to allow multiple quantum computers to work as one, as regular listeners have heard discussed on this show before.
Excited by the future of quantum networking and want to be a part of memQ? The company is hiring. Check out their website in the show notes for more information.
That does it for this episode. Thanks to Manish Kumar Singh and Sean Sullivan for joining to discuss memQ and quantum networking. Thank you for listening. If you enjoy the show, please subscribe to Protiviti’s The Post-Quantum World, and leave a review to help others find us. Be sure to follow me on Twitter and Instagram @konstanthacker. You’ll find links there to what we’re doing in Quantum Computing Services at Protiviti. You can also DM me questions or suggestions for what you like to hear on the show. For more information on our quantum services, check out Protiviti.com, or follow Protiviti Tech on Twitter and LinkedIn. Until next time, be kind, and stay quantum curious.