Deterministic remote entanglement using a chiral quantum interconnect

Abstract

Quantum interconnects facilitate entanglement distribution between non-local computational nodes. 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. We leverage quantum interference to emit and absorb microwave photons on demand and in a chosen direction between these modules. We optimize the protocol using model-free reinforcement learning to maximize 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 62.4 +/- 1.6% (leftward photon propagation) and 62.1 +/- 1.2% (rightward) fidelity, limited mainly by propagation loss. A chiral quantum network comprising many modules provides a platform for the exploration of novel many-body physics and quantum simulation. This quantum network architecture enables all-to-all connectivity between non-local processors for modular and extensible quantum computation.

27 pages, 9 figures, 6 tables

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• Dressed Interference in Giant Superatoms: Entanglement Generation and Transfer
• A Multilevel Framework for Partitioning Quantum Circuits
• A thermal-noise-resilient microwave quantum network traversing 4 K
• Generation of Frequency-Tunable Shaped Single Microwave Photons Using a Fixed-Frequency Superconducting Qubit
• Mitigating cosmic ray-like correlated events with a modular quantum processor
• Environmental Quantum States Trigger Emission in Nonlinear Photonics
• Scalable and modular generation of multipartite entangled states through memory-enhanced fusion
• Loss-induced quantum nonreciprocity and entanglement in superconducting qubits
• Chirality, Nonreciprocity and Symmetries for a Giant Atom
• Highly efficient microwave storage and retrieval using a superconducting chiral $\Lambda$-type molecule
• Scalable Low-overhead Superconducting Non-local Coupler with Exponentially Enhanced Connectivity
• Realizing on-demand all-to-all selective interactions between distant spin ensembles
• Tunable frequency conversion and comb generation with a superconducting artificial atom
• Engineering giant transmon molecules as mediators of conditional two-photon gates
• Deterministic Quantum Communication Between Fixed-Frequency Superconducting Qubits via Broadband Resonators