Quantum random access memory architectures using superconducting cavities

• URL: http://arxiv.org/abs/2310.08288v3
• Date: Mon, 25 Mar 2024 22:43:59 GMT
• Title: Quantum random access memory architectures using superconducting cavities
• Authors: D. K. Weiss, Shruti Puri, S. M. Girvin,
• Abstract summary: We propose two bucket-brigade QRAM architectures based on high-coherence superconducting resonators. We analyze single-rail and dual-rail implementations of a bosonic qubit. For parameter regimes of interest the post-selected infidelity of a QRAM query in a dual-rail architecture is nearly an order of magnitude below that of a corresponding query in a single-rail architecture.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Quantum random access memory (QRAM) is a common architecture resource for algorithms with many proposed applications, including quantum chemistry, windowed quantum arithmetic, unstructured search, machine learning, and quantum cryptography. Here we propose two bucket-brigade QRAM architectures based on high-coherence superconducting resonators, which differ in their realizations of the conditional-routing operations. In the first, we directly construct controlled-$\mathsf{SWAP}$ ($\textsf{CSWAP}$) operations, while in the second we utilize the properties of giant-unidirectional emitters (GUEs). For both architectures we analyze single-rail and dual-rail implementations of a bosonic qubit. In the single-rail encoding we can detect first-order ancilla errors, while the dual-rail encoding additionally allows for the detection of photon losses. For parameter regimes of interest the post-selected infidelity of a QRAM query in a dual-rail architecture is nearly an order of magnitude below that of a corresponding query in a single-rail architecture. These findings suggest that dual-rail encodings are particularly attractive as architectures for QRAM devices in the era before fault tolerance.

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