Good news! More rapid progress on quantum computing!
How good are isolated quantum computational nodes?
"Current architectures used to interconnect superconducting quantum processors are “point-to-point” in connectivity, meaning they require a series of transfers between network nodes, with compounding error rates.
On the way to overcoming these challenges, ... researchers developed a new interconnect device that can support scalable, “all-to-all” communication, such that all superconducting quantum processors in a network can communication directly with each other. ..."
From the abstract:
"Quantum interconnects facilitate entanglement distribution between non-local computational nodes in a quantum network. For superconducting processors, microwave photons are a natural means to mediate this distribution. However, many existing architectures limit node connectivity and directionality.
In this work, we construct a chiral quantum interconnect between two nominally identical modules in separate microwave packages. Our approach uses quantum interference to emit and absorb microwave photons on demand and in a chosen direction between these modules.
We optimize our protocol using model-free reinforcement learning to maximize the absorption efficiency. By halting the emission process halfway through its duration, we generate remote entanglement between modules in the form of a four-qubit W state with approximately 62% fidelity in each direction, limited mainly by propagation loss.
This quantum network architecture enables all-to-all connectivity between non-local processors for modular and extensible quantum simulation and computation."
Deterministic remote entanglement using a chiral quantum interconnect (no public access)
Deterministic remote entanglement using a chiral quantum interconnect (preprint, open access)
Figure 1: Chiral quantum interconnect experimental set-up. a)
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