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Geometric Pathway to Scalable Quantum Sensing.

Mattias T Johnsson1, Nabomita Roy Mukty1, Daniel Burgarth1

  • 1Center for Engineered Quantum Systems, Department of Physics and Astronomy, Macquarie University, North Ryde, 2109 New South Wales, Australia.

Physical Review Letters
|November 20, 2020
PubMed
Summary
This summary is machine-generated.

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We developed a quantum control strategy using geometric phase gates to prepare entangled states for quantum sensing. This method simplifies state preparation and enhances resilience to decoherence, improving metrology performance.

Area of Science:

  • Quantum Information Science
  • Quantum Metrology
  • Quantum Control

Background:

  • Entangled states are crucial for quantum sensing, enabling Heisenberg scaling beyond the standard quantum limit.
  • Preparing large entangled states is difficult due to decoherence and the need for complex control methods.

Purpose of the Study:

  • To present a novel quantum control strategy for synthesizing entangled states on the Dicke subspace.
  • To enable efficient preparation of states for enhanced quantum metrology.

Main Methods:

  • Utilizing highly nonlinear geometric phase gates for state and unitary synthesis.
  • Employing a dispersive coupling of spins to a common bosonic mode.
  • Applying amplitude amplification to simplify control sequences and enhance robustness.

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Main Results:

  • The proposed method allows for generic state synthesis with O(N) gates and unitary synthesis with O(N^2) gates.
  • A simplified control sequence using O(N^{5/4}) geometric phase gates is achieved for metrology states.
  • The strategy demonstrates robustness against mode decay and dephasing errors due to its geometric path and built-in dynamical decoupling.

Conclusions:

  • This quantum control strategy offers an efficient and robust method for preparing entangled states for quantum sensing.
  • The approach overcomes challenges associated with decoherence and simplifies the preparation of high-performance metrology states.