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Bouchard, Frédéric ; Koutný, Dominik ; Hufnagel, Felix ; Hradil, Zdenek ; Rehácek, Jaroslav ; Yong-Siah, Teo ; Ahn, Daekun ; Jeong, Hyunseok ; Sánchez Soto, Luis Lorenzo ; Leuchs, Gerd ; Karimi, Ebrahim | The Optical Society Of America | 2019-06-24The ability to completely characterize the state of a system is an essential element for the emerging quantum technologies. Here, we present a compressed-sensing-inspired method to ascertain any rank-deficient qudit state, which we experimentall[...]texto impreso
Rudnicki, Lukasz ; Sánchez Soto, Luis Lorenzo ; Leuchs, Gerd ; Boyd, R. W. | Optical Society of America | 2020-08-15We establish the ultimate limits that quantum theory imposes on the accuracy attainable in optical ellipsometry. We show that the standard quantum limit, as usually reached when the incident light is in a coherent state, can be surpassed with th[...]texto impreso
Teo, Yong Siah ; Struchalin, G. I. ; Kovlakov, E. V. ; Ahn, Daekun ; Jeong, Hyunseok ; Straupe, S. S. ; Kulik, S. P. ; Leuchs, Gerd ; Sánchez Soto, Luis Lorenzo | Amer Physical Soc | 2020-02-01We present a compressive quantum process tomography scheme that fully characterizes any rank-deficient completely positive process with no spurious a priori information. It uses randomly chosen input states and adaptive output von Neumann measur[...]texto impreso
The properties of the vacuum are described by quantum physics including the response to external fields such as electromagnetic radiation. Of the two parameters that govern the details of the electromagnetic field dynamics in vacuum, one is fixe[...]texto impreso
Valtierra, Iván F. ; Klimov, A.B. ; Leuchs, Gerd ; Sánchez Soto, Luis Lorenzo | Amer Physical Soc | 2020-03-02We present analytic expressions for the s-parametrized currents on the sphere for both unitary and dissipative evolutions. We examine the spatial distribution of the flow generated by these currents for quadratic Hamiltonians. The results are ap[...]texto impreso
We address the response, both in amplitude and intensity, of a Fabry–Perot from a variety of viewpoints. These complementary pictures conspire to achieve a comprehensive and consistent theory of the operation of this system.texto impreso
Kim, Yosep ; Yong-Siah, Teo ; Daekun, Ahn ; Im, Dong Gil ; Cho, Young Wook ; Leuchs, Gerd ; Sánchez Soto, Luis Lorenzo ; Hynseok, Jeong ; Kim, Yoon-Ho | American Physical Society | 2020-05-27Recent quantum technologies utilize complex multidimensional processes that govern the dynamics of quantum systems. We develop an adaptive diagonal-element-probing compression technique that feasibly characterizes any unknown quantum processes u[...]texto impreso
Seyfarth, U. ; Klimov, A.B. ; Guise, H. de ; Leuchs, Gerd ; Sánchez Soto, Luis Lorenzo | Verein Forderung Open Access Publizierens Quantenwissenschaf | 2020-09-07In spite of their potential usefulness, Wigner functions for systems with SU(1,1) symmetry have not been explored thus far. We address this problem from a physically-motivated perspective, with an eye towards applications in modern metrology. St[...]
