Quantum Switches for Gottesman-Kitaev-Preskill Qubit-based All-Photonic Quantum Networks

Abstract

The Gottesman-Kitaev-Preskill (GKP) code, being information theoretically near optimal for quantum communication over Gaussian thermal-loss optical channels, is likely to be the encoding of choice for advanced quantum networks of the future. Quantum repeaters based on GKP-encoded light have been shown to support high end-to-end entanglement rates across large distances despite realistic finite squeezing in GKP code preparation and homodyne detection inefficiencies. Here, we introduce a quantum switch for GKP-qubit-based quantum networks, whose architecture involves multiplexed GKP-qubit-based entanglement link generation with clients, and their all-photonic storage, together enabled by GKP-qubit graph state resources. For bipartite entanglement distribution between clients via entanglement swapping, the switch uses a multi-client generalization of a recently introduced $\text{entanglement-ranking-based link matching}$ protocol heuristic. Since generating the GKP-qubit graph state resource is hardware intensive, given a total resource budget and an arbitrary layout of clients, we address the question of their optimal allocation towards the different client-pair connections served by the switch such that the sum throughput of the switch is maximized while also being fair in terms of the individual entanglement rates. We illustrate our results for an exemplary data center network, where the data center is a client of a switch and all of its other clients aim to connect to the data center alone -- a scenario that also captures the general case of a gateway router connecting a local area network to a global network. Together with compatible quantum repeaters, our quantum switch provides a way to realize quantum networks of arbitrary topology.

arXiv comment13 pages, 8 Figures

References in corpus (22)

• Gaussian Quantum Information
• Encoding a qubit in an oscillator
• General Benchmarks for Quantum Repeaters
• Fundamental Limits of Repeaterless Quantum Communications
• Optimal eavesdropping in quantum cryptography with six states
• Quantum Error Correction for Beginners
• Validating quantum computers using randomized model circuits
• Large Scale Modular Quantum Computer Architecture with Atomic Memory and Photonic Interconnects
• Photonic quantum information processing: a review
• Photonic quantum information processing: a concise review
• Distributed quantum sensing in a continuous variable entangled network
• Progress towards practical qubit computation using approximate Gottesman-Kitaev-Preskill codes
• Improved quantum capacity bounds of Gaussian loss channels and achievable rates with Gottesman-Kitaev-Preskill codes
• Distributed quantum sensing with a mode-entangled network of spin-squeezed atomic states
• Photonic Quantum Networks formed from NV- Centers
• All-Optical Long-Distance Quantum Communication with Gottesman-Kitaev-Preskill qubits
• Quantum repeaters based on concatenated bosonic and discrete-variable quantum codes
• Multiplexed quantum repeaters based on dual-species trapped-ion systems
• Data centers with quantum random access memory and quantum networks
• All-photonic GKP-qubit repeater using analog-information-assisted multiplexed entanglement ranking
• Modular Quantum Computation in a Trapped Ion System
• A Continuous Variable Quantum Switch

Cited by in corpus (2)

• Review of Distributed Quantum Computing. From single QPU to High Performance Quantum Computing
• Reducing classical communication costs in multiplexed quantum repeaters using hardware-aware quasi-local policies