Quantum error correction via robust probe modes

Abstract

We propose a new scheme for quantum error correction using robust continuous variable probe modes, rather than fragile ancilla qubits, to detect errors without destroying data qubits. The use of such probe modes reduces the required number of expensive qubits in error correction and allows efficient encoding, error detection and error correction. Moreover, the elimination of the need for direct qubit interactions significantly simplifies the construction of quantum circuits. We will illustrate how the approach implements three existing quantum error correcting codes: the 3-qubit bit-flip (phase-flip) code, the Shor code, and an erasure code.

5 pages, 3 figures

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• Multi-qubit parity measurement in circuit quantum electrodynamics
• Weak non-linearities and cluster states
• Stabilizer Quantum Error Correction with Qubus Computation
• Flying-cat parity checks for quantum error correction