Abstract
Quantum data are susceptible to decoherence induced by
the environment and to errors in the hardware processing
it. A future fault-tolerant quantum computer will use
quantum error correction to actively protect against
both. In the smallest error correction codes, the
information in one logical qubit is encoded in a
two-dimensional subspace of a larger Hilbert space of
multiple physical qubits. For each code, a set of
non-demolition multi-qubit measurements, termed
stabilizers, can discretize and signal physical qubit
errors without collapsing the encoded information. Here
using a five-qubit superconducting processor, we realize
the two parity measurements comprising the stabilizers of
the three-qubit repetition code protecting one logical
qubit from physical bit-flip errors. While increased
physical qubit coherence times and shorter quantum error
correction blocks are required to actively safeguard the
quantum information, this demonstration is a critical
step towards larger codes based on multiple parity
measurements.
Original language | English |
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Article number | 6983 |
Journal | Nature Communications |
Volume | 6 |
DOIs | |
Publication status | Published - 2015 |
MoE publication type | A1 Journal article-refereed |
Keywords
- Applied physics
- Quantum information
- Qubits
- Superconducting properties and materials