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Add to Calendar 4/3/2019 1:00 pm 4/3/2019 America/Chicago QI/AMO Seminar: "Quantum metrology in the presence of dissipation with superconducting qubits" DESCRIPTION:

In quantum metrology, one seeks to utilize quantum properties such as superposition and entanglement to reduce noise or enhance sensitivities. While this can lead to significant advantages over classical systems, quantum metrology is in practice challenging because the quantum states that confer such advantages are degraded by decoherence.  In this talk, I will discuss recent experiments where we harness techniques in quantum control to accelerate frequency estimation, achieving a 1/T^2 scaling in the uncertainty for an oscillation frequency. This acceleration in frequency sensitivity is ultimately short lived, as decoherence can quickly degrade this quantum advantage. To circumvent this limitation, I will discuss experiments that explore strategies to mitigate this degradation through continuous quantum measurement and feedback. Furthermore, dissipation also yields potential for further metrological advantages that are associated with exceptional point degeneracies in non-Hermitian systems. I will discuss how such degeneracies can be realized in single dissipative qubits and present investigations of enhanced measurement sensitivity near the exceptional point of an effective non-Hermitian qubit.

\n\nSPEAKER: Kater Murch, Washigton University St. Louis
280 MRL false

QI/AMO Seminar: "Quantum metrology in the presence of dissipation with superconducting qubits"

Speaker Kater Murch, Washigton University St. Louis
Date: 4/3/2019
Time: 1 p.m.
Location: 280 MRL
Event Contact: Marjorie Gamel
217-333-3762
mgamel@illinois.edu
Sponsor: Department of Physics
Event Type: Other
 

In quantum metrology, one seeks to utilize quantum properties such as superposition and entanglement to reduce noise or enhance sensitivities. While this can lead to significant advantages over classical systems, quantum metrology is in practice challenging because the quantum states that confer such advantages are degraded by decoherence.  In this talk, I will discuss recent experiments where we harness techniques in quantum control to accelerate frequency estimation, achieving a 1/T^2 scaling in the uncertainty for an oscillation frequency. This acceleration in frequency sensitivity is ultimately short lived, as decoherence can quickly degrade this quantum advantage. To circumvent this limitation, I will discuss experiments that explore strategies to mitigate this degradation through continuous quantum measurement and feedback. Furthermore, dissipation also yields potential for further metrological advantages that are associated with exceptional point degeneracies in non-Hermitian systems. I will discuss how such degeneracies can be realized in single dissipative qubits and present investigations of enhanced measurement sensitivity near the exceptional point of an effective non-Hermitian qubit.

To request disability-related accommodations for this event, please contact the person listed above, or the unit hosting the event.

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