Enhanced Multiqubit Phase Estimation in Noisy Environments by Local Encoding.

@article{Proietti2019EnhancedMP,
  title={Enhanced Multiqubit Phase Estimation in Noisy Environments by Local Encoding.},
  author={Massimiliano Proietti and Martin Ringbauer and Francesco Graffitti and Peter Barrow and Alexander Pickston and Dmytro Kundys and Daniel Cavalcanti and Leandro Aolita and Rafael Chaves and Alessandro Fedrizzi},
  journal={Physical review letters},
  year={2019},
  volume={123 18},
  pages={
          180503
        }
}
The first generation of multiqubit quantum technologies will consist of noisy, intermediate-scale devices for which active error correction remains out of reach. To exploit such devices, it is thus imperative to use passive error protection that meets a careful trade-off between noise protection and resource overhead. Here, we experimentally demonstrate that single-qubit encoding can significantly enhance the robustness of entanglement and coherence of four-qubit graph states against local… Expand
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References

SHOWING 1-10 OF 86 REFERENCES
Robust multipartite quantum correlations without complex encodings
One of the main challenges for the manipulation and storage of multipartite entanglement is its fragility under noise. We present a simple recipe for the systematic enhancement of the resistance ofExpand
Demonstrating Quantum Coherence and Metrology that is Resilient to Transversal Noise.
TLDR
This work experimentally investigates the resilient effect of quantum coherence in a photonic Greenberger-Horne-Zeilinger state under Markovian bit-flip noise, and explores its applications in a noisy metrology scenario, highlighting the important role of passive control in noisy quantum hardware. Expand
Using entanglement against noise in quantum metrology.
TLDR
It is proved that entangled strategies can have higher precision than unentangled ones and that the addition of passive external ancillas can also increase the precision. Expand
Resource-efficient linear optical quantum computation.
TLDR
This work introduces a scheme for linear optics quantum computation, that makes no use of teleported gates, and requires stable interferometry over only the coherence length of the photons, and demonstrates the universality and usefulness of generic parity measurements. Expand
Using entanglement against noise in quantum metrology [ 1 ]
FIG. 1. Quantum metrology strategies. The maps Λφ encode the parameter φ to be estimated. (i) sequential scheme: Λφ acts n times sequentially on N/n input probes ρ (this is an entanglement-freeExpand
Ultimate Precision of Adaptive Noise Estimation.
TLDR
The ultimate precision for estimating excess noise in a thermal-loss channel is established, which is crucial for quantum cryptography and can be applied to simplify other adaptive protocols, including those for quantum channel discrimination. Expand
Noisy metrology beyond the standard quantum limit.
TLDR
It is shown that precision can be significantly enhanced when the noise is concentrated along some spatial direction, while the Hamiltonian governing the evolution which depends on the parameter to be estimated can be engineered to point along a different direction. Expand
Qubit metrology and decoherence
Quantum properties of the probes used to estimate a classical parameter can be used to attain accuracies that beat the standard quantum limit. When qubits are used to construct a quantum probe, it isExpand
The elusive Heisenberg limit in quantum-enhanced metrology
TLDR
It is shown that when decoherence is taken into account, the maximal possible quantum enhancement in the asymptotic limit of infinite N amounts generically to a constant factor rather than quadratic improvement. Expand
Multipartite entanglement and high precision metrology
We present several entanglement criteria in terms of the quantum Fisher information that help to relate various forms of multipartite entanglement to the sensitivity of phase estimation. We show thatExpand
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4
5
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