Dynamically Reconfigurable Photon Exchange in a Superconducting Quantum Processor

• URL: http://arxiv.org/abs/2303.03507v1
• Date: Mon, 6 Mar 2023 21:28:48 GMT
• Title: Dynamically Reconfigurable Photon Exchange in a Superconducting Quantum Processor
• Authors: Brian Marinelli, Jie Luo, Hengjiang Ren, Bethany M. Niedzielski, David K. Kim, Rabindra Das, Mollie Schwartz, David I. Santiago, and Irfan Siddiqi
• Abstract summary: Large-scale quantum computation faces the challenge of efficiently generating entanglement between many qubits. Here we propose and demonstrate a novel, on-chip photon exchange network. We show long-range qubit-qubit interactions between qubits with a maximum spatial separation of $9.2textcm$ along a meandered bus resonator.
• Score: 1.0614955682118588
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Realizing the advantages of quantum computation requires access to the full Hilbert space of states of many quantum bits (qubits). Thus, large-scale quantum computation faces the challenge of efficiently generating entanglement between many qubits. In systems with a limited number of direct connections between qubits, entanglement between non-nearest neighbor qubits is generated by a series of nearest neighbor gates, which exponentially suppresses the resulting fidelity. Here we propose and demonstrate a novel, on-chip photon exchange network. This photonic network is embedded in a superconducting quantum processor (QPU) to implement an arbitrarily reconfigurable qubit connectivity graph. We show long-range qubit-qubit interactions between qubits with a maximum spatial separation of $9.2~\text{cm}$ along a meandered bus resonator and achieve photon exchange rates up to $g_{\text{qq}} = 2\pi \times 0.9~\text{MHz}$. These experimental demonstrations provide a foundation to realize highly connected, reconfigurable quantum photonic networks and opens a new path towards modular quantum computing.

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