Results 11 to 20 of about 60,354 (258)

Process tomography of ion trap quantum gates [PDF]

Physical Review Letters, 2006
A crucial building block for quantum information processing with trapped ions is a controlled-NOT quantum gate. In this paper, two different sequences of laser pulses implementing such a gate operation are analyzed using quantum process tomography ...
C. F. Roos, D. J. Wineland, H. Häffner, K. Kim, M. Riebe, P. O. Schmidt, P. Schindler, R. Blatt, T. K. Körber, T. Monz, W. Hänsel   +10 more
core   +5 more sources

Projected Least-Squares Quantum Process Tomography [PDF]

Quantum, 2022
We propose and investigate a new method of quantum process tomography (QPT) which we call projected least squares (PLS). In short, PLS consists of first computing the least-squares estimator of the Choi matrix of an unknown channel, and subsequently ...
Trystan Surawy-Stepney, Jonas Kahn, Richard Kueng, Madalin Guta   +3 more
doaj   +3 more sources

Fourier Quantum Process Tomography

npj Quantum Information
The characterization of a quantum device is a crucial step in the development of quantum experiments. This is accomplished via Quantum Process Tomography, which combines the outcomes of different projective measurements to deliver a possible ...
Francesco Di Colandrea, Nazanin Dehghan, Alessio D’Errico, Ebrahim Karimi   +3 more
doaj   +4 more sources

Confidence polytopes for quantum process tomography

New Journal of Physics, 2021
In the present work, we propose a generalization of the confidence polytopes approach for quantum state tomography (QST) to the case of quantum process tomography (QPT).
E O Kiktenko, D O Norkin, A K Fedorov
doaj   +3 more sources

Shadow process tomography of quantum channels [PDF]

Physical Review A, 2023
12 pages, 5 figures; Added citation to similar work; Errors corrected. Previous statements of main result first missed and then miscalculated an exponential cost in system size; Version accepted for ...
Jonathan Kunjummen, Minh C. Tran, Daniel Carney, Jacob M. Taylor   +3 more
openaire   +5 more sources

Quantum process tomography on holographic metasurfaces

npj Quantum Information, 2022
Holographic metasurfaces and their applications have garnered significant attention owing to their role in polarization control. In this study, we demonstrate that the quantum properties of holographic metasurfaces can be obtained by quantum state ...
Qing-Yuan Wu, Zhe Meng, Jia-Zhi Yang, An-Ning Zhang   +3 more
doaj   +2 more sources

Quantum process tomography of a controlled-NOT gate [PDF]

Physical Review Letters, 2004
We demonstrate complete characterization of a two-qubit entangling process - a linear optics controlled-NOT gate operating with coincident detection - by quantum process tomography.
Gilchrist, A., James, D. F. V., Langford, N. K., O'Brien, J. L., Pryde, G. J., Ralph, T. C., White, A. G.   +6 more
core   +7 more sources

Choi's Proof and Quantum Process Tomography [PDF]

, 2002
Quantum process tomography is a procedure by which an unknown quantum operation can be fully experimentally characterized. We reinterpret Choi's proof of the fact that any completely positive linear map has a Kraus representation [Lin. Alg. and App., 10,
Childs, Choi, Chuang, Cory, Debbie W. Leung, D’Ariano, D’Ariano, Gershenfeld, Kraus, Leung, Maccone, Nielsen, Nielsen, Poyatos, Schumacher, Schumacher, Stinespring, Vogel   +17 more
core   +3 more sources

Quantum process tomography with coherent states

New Journal of Physics, 2010
We develop an enhanced technique for characterizing quantum optical processes based on probing unknown quantum processes only with coherent states. Our method substantially improves the original proposal [M. Lobino et al., Science 322, 563 (2008)], which
Lvovsky, A. I., Mann, Ady, Rahimi-Keshari, Saleh, Rezakhani, Ali T., Sanders, Barry C., Scherer, Artur   +5 more
core   +5 more sources

Optimizing the Choice of Spin-Squeezed States for Detecting and Characterizing Quantum Processes

Physical Review X, 2014
Quantum metrology uses quantum states with no classical counterpart to measure a physical quantity with extraordinary sensitivity or precision. Most such schemes characterize a dynamical process by probing it with a specially designed quantum state.
Lee A. Rozema, Dylan H. Mahler, Robin Blume-Kohout, Aephraim M. Steinberg   +3 more
doaj   +3 more sources