157

Quantum information about unknown parameters can be compressed unboundedly without loss

July 14, 2022 by | Uncategorized

Wednesday, 27 July 2022 @ 12 PM in 149 Keck Center, or join us on Zoom. Abstract: Several tasks in quantum-information processing involve quantum learning. For example, quantum sensing, quantum machine learning and quantum-computer calibration involve learning and estimating unknown parameters from measurements of many copies of a quantum state that depends on those parameters.

151

Quantum processes with quantum causal structure

June 16, 2022 by | Uncategorized

Thursday, 30 June 2022 @ 12 PM in 149 Keck Center, or join us on Zoom. Abstract: Quantum Theory requires a background causal structure for its formulation, with temporal and spatial correlations treated in a very asymmetric way. However, spacetime might lose its classical properties  when Quantum Theory combines with General Relativity. This motivates a

148

Superoscillations - Theoretical Aspects and Applications Symposium 2

May 27, 2022 by | Uncategorized

Symposium Information Superoscillations were identified independently by Sir Michael Berry and Yakir Aharonov in very different contexts, but in the last several years the communities of mathematicians and physicists have taken increased interest in this phenomenon, both because of its interesting mathematical characteristics, and because of its many potential applications. This symposium is intended not

140

Post-selection and Quantum Energetics

May 17, 2022 by | Uncategorized

Tuesday, 24 May 2022 @ 2 PM in 149 Keck Center, or join us on Zoom. Abstract: We investigate the anomalous energy change of the measurement apparatus when a qubit is measured in bases that do not commute with energy. We model two possible measurement implementations: one is a quantum clock model with a completely

131

Quantum Theory faces Cosmology, and vice-versa

May 9, 2022 by | Uncategorized

Thursday, 12 May 2022 @ 4 PM. Join us on Zoom. Abstract: In its usual formulation, Quantum Theory presents apparently unavoidable difficulties when applied to Cosmology. Hence, either it is assumed that the Quantum Theory is not wide enough to apply to the physics of the Universe, nowadays successfully tested by numerous sophisticated observations, or

126

Bounding quantum advantages in Postselected Metrology

April 28, 2022 by | Uncategorized

Friday, 6 May 2022 @ 9 AM. Join us on Zoom. Abstract: Weak value amplification and other postselection-based metrological protocols can enhance precision while estimating small parameters, outperforming postselection-free protocols. In general, these enhancements are largely constrained because the protocols yielding higher precision are rarely obtained due to a lower probability of successful postselection. It

122

Quantum Steampunk: The Physics of Yesterday's Tomorrow

April 22, 2022 by | Uncategorized

Wednesday, 27 April in 404 Beckman Hall at 6PM, or join us on Zoom. The Industrial Revolution meets the quantum-technology revolution! A steampunk adventure guide to how mind-blowing quantum physics is transforming our understanding of information and energy. Victorian era steam engines and particle physics may seem worlds (as well as centuries) apart, yet a

114

Weak measurements and quantum Zeno effect

April 18, 2022 by | Uncategorized

Friday, 22 April 2022 @ 9 AM. Join us on Zoom. Abstract: A quantum decaying system can reveal its nonclassical behavior by being noninvasively measured. Correlations of weak measurements in the noninvasive limit violate the classical bound for a universal class of systems. The violation is related to incompatibility between exponential decay and unitary evolution,

110

Detecting Axions from electron-spin precession

April 12, 2022 by | Uncategorized

Thursday, 14 April 2022 @ 4 PM in 149 Keck Center, or join us on Zoom. Abstract:  After a pedagogical introduction of Axion and the Strong CP problem, I will show how the axion induces an additional spin-precession in the Schrodinger equation.  We will together explore the possibility of using ideas in weak measurements to

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