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Utilizing error correction for quantum sensing. Yuval Vinkler Hebrew University of Jerusalem Work done with : Alex Retzker Gilad Arrad Dorit Aharonov Talk at the Israel Physical Society Conference 1.12.2013. Quantum Sensing.
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Utilizing error correction for quantum sensing Yuval Vinkler Hebrew University of Jerusalem Work done with: Alex Retzker GiladArrad DoritAharonov Talk at the Israel Physical Society Conference 1.12.2013
Quantum Sensing In Quantum sensing a signal is measured by reading its effects on a system. For example: for a signal g along the z direction Quantum sensing scales as: One method to improve coherence time: dynamical decoupling. Can this be done with error correction?
General Idea of error correction for quantum computing error1 error2 Error N Code Logical operation
General Idea of error correction for quantum sensing error1 error2 Error N Code However, the sensing signal is weak/slow and the logical operation is strong/fast Sensing signal
Advantage – use of protected qubits Code Sensing qubit Good qubits
Magnetic noise noise signal The code using a good qubit: Signal: The effect of noise: While dynamical decoupling must operate faster than the correlation time of the noise, error correction must work faster than the magnitude of the noise, regardless its power spectrum.
Magnetic Noise – Numerical Simulation Works even with strong noise (with respect to g). Strong dependence on the frequency of operations – the faster we act, the better the signal.
Summary • The principles of Error Corrections were employed to improve quantum sensing. • For noise perpendicular to the sensing signal – a significant improvement in coherence time. • Operations must be faster than noise strength. Can be slower noise power spectrum. • Outlook: experiments (in progress), decoherence type spectroscopy.