Bias-preserving cat-cat CNOT gate via vacuum-conditional beam-splitter

• URL: http://arxiv.org/abs/2607.22852v1
• Date: Fri, 24 Jul 2026 18:48:10 GMT
• Title: Bias-preserving cat-cat CNOT gate via vacuum-conditional beam-splitter
• Abstract summary: Cat qubits can exhibit strong noise bias due to their exponentially enhanced bit-flip times.<n>It is difficult to maintain this strong noise bias in logical operations such as CNOT gates between cats.<n>We propose a coherent CNOT gate scheme between two dissipative cats that preserves the exponential noise bias.
• Score: 2.3975260235305225
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Cat qubits can exhibit strong noise bias due to their exponentially enhanced bit-flip times and only polynomially reduced phase-flip times with increasing photon number, which makes them attractive candidates for hardware-efficient quantum error correction. However, it is difficult to maintain this strong noise bias in logical operations such as CNOT gates between cats. Here, we propose a coherent CNOT gate scheme between two dissipative cats that preserves the exponential noise bias. The proposed gate relies only on unitary operations, which avoids the non-idealities associated with many existing gate schemes that rely on engineered dissipations. Assuming good component lifetimes and precise nonlinearity engineering, the proposed gate can enable logical memory in the megaquop regime (logical error rates < 10^-6) with a distance-7 repetition code consisting of 13 cat qubits.

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