Efficient Generation of Multi-partite Entanglement between Non-local Superconducting Qubits using Classical Feedback

• URL: http://arxiv.org/abs/2403.18768v1
• Date: Wed, 27 Mar 2024 17:06:00 GMT
• Title: Efficient Generation of Multi-partite Entanglement between Non-local Superconducting Qubits using Classical Feedback
• Authors: Akel Hashim, Ming Yuan, Pranav Gokhale, Larry Chen, Christian Juenger, Neelay Fruitwala, Yilun Xu, Gang Huang, Liang Jiang, Irfan Siddiqi,
• Abstract summary: In gate-based quantum computing, the creation of entangled states or the distribution of entanglement across a quantum processor often requires circuit depths which grow with the number of entangled qubits. In teleportation-based quantum computing, one can deterministically generate entangled states with a circuit depth that is constant in the number of qubits.
• Score: 14.740159711831723
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Quantum entanglement is one of the primary features which distinguishes quantum computers from classical computers. In gate-based quantum computing, the creation of entangled states or the distribution of entanglement across a quantum processor often requires circuit depths which grow with the number of entangled qubits. However, in teleportation-based quantum computing, one can deterministically generate entangled states with a circuit depth that is constant in the number of qubits, provided that one has access to an entangled resource state, the ability to perform mid-circuit measurements, and can rapidly transmit classical information. In this work, aided by fast classical FPGA-based control hardware with a feedback latency of only 150 ns, we explore the utility of teleportation-based protocols for generating non-local, multi-partite entanglement between superconducting qubits. First, we demonstrate well-known protocols for generating Greenberger-Horne-Zeilinger (GHZ) states and non-local CNOT gates in constant depth. Next, we utilize both protocols for implementing an unbounded fan-out (i.e., controlled-NOT-NOT) gate in constant depth between three non-local qubits. Finally, we demonstrate deterministic state teleportation and entanglement swapping between qubits on opposite side of our quantum processor.

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