Speaker
Description
Quantum error correction provides a path to fault-tolerant quantum computation, even in the presence of noisy hardware. However, it comes at the cost of a large overhead; many physical qubits are required to encode a single, error-corrected logical qubit. Fortunately, this overhead may be mitigated by using hardware with structured noise. In particular, erasure errors — that is, detected loss or leakage of the physical qubits — can be corrected much more efficiently than bit-flip or phase-flip errors. However, the ability to engineer erasure errors in superconducting qubits has previously come at the cost of additional hardware requirements, namely, the need for multi-mode circuits to encode a physical qubit. In this work, we describe a hardware-efficient erasure qubit encoded in a single-mode superconducting circuit. We show that fluxonium (a particular kind of superconducting circuit) can utilised as an erasure qubit, without additional hardware. We describe how the parameters of the superconducting circuit may be chosen to make detectable leakage the predominant error. We also describe methods of control and measurement.
| I am the presenting author | Yes |
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