06. QUANTUM MEASUREMENTS

Scalable reconstruction of unitary processes and Hamiltonians

Date: 
2014-12-08 - 2015-04-29
Author(s): 

M. Holzäpfel, T. Baumgratz, M. Cramer, and M. B. Plenio

Reference: 

Phys. Rev. A 91, 042129

Based on recently introduced efficient quantum state tomography schemes, we propose a scalable method for the tomography of unitary processes and the reconstruction of one-dimensional local Hamiltonians.

Proof of Heisenberg's error-disturbance relation

Date: 
2013-10-17 - 2014-01-28
Author(s): 

Paul Busch, Pekka Lahti, Reinhard F. Werner

Reference: 

Physical Review Letters 111, 160405 (2013)

While the slogan “no measurement without disturbance” has established itself under the name of the Heisenberg effect in the consciousness of the scientifically interested public, a precise statement of this fundamental feature of the quantum world has remained elusive, and serious attempts at rigorous formulations of it as a consequence of quantum theory have led to seemingly conflict

Heisenberg uncertainty for qubit measurements

Date: 
2014-01-31 - 2014-06-03
Author(s): 

Paul Busch, Pekka Lahti, Reinhard F. Werner

Reference: 

Phys. Rev. A 89, 012129

Measurement uncertainty relations

Date: 
2014-01-28 - 2014-06-03
Author(s): 

Paul Busch, Pekka Lahti, Reinhard F. Werner

Reference: 

Journal of Mathematical Physics 55, 042111 (2014)
doi: 10.1063/1.4871444

Noise Operators and Measures of RMS Error and Disturbance in Quantum Mechanics

Date: 
2013-12-16 - 2014-01-28
Author(s): 

Paul Busch, Pekka Lahti, Reinhard F. Werner

Reference: 

arXiv: 1312.4393 [quant-ph]

The quantum Zeno effect and quantum feedback in cavity QED

Date: 
2010-09-30
Author(s): 

I. Dotsenko, J. Bernu, S. Deléglise, C. Sayrin, M. Brune, J.M. Raimond, S. Haroche, M. Mirrahimi, P. Rouchon

Reference: 

Physica Scripta T140, 014004 (2010)
doi: 10.1088/0031-8949/2010/T140/014004

We explore experimentally the fundamental projective properties of a quantum measurement and their application in the control of a system’s evolution. We perform quantum non-demolition (QND) photon counting on a microwave field trapped in a very-high-Q superconducting cavity, employing circular Rydberg atoms as non-absorbing probes of light. By repeated measurement of the cavity field we demonstrated the freeze of its initially coherent evolution, illustrating the back action of the photon number measurement on the field’s phase.

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