Experimental Progress on Quantum Coherence: Detection, Quantification, and Manipulation

Abstract

Quantum coherence is a fundamental property of quantum systems, separating quantum from classical physics. Recently, there has been significant interest in the characterization of quantum coherence as a resource, investigating how coherence can be extracted and used for quantum technological applications. In this work, the progress of this research is reviewed, focusing in particular on recent experimental efforts. After a brief review of the underlying theory, the main platforms for realizing the experiments are discussed: linear optics, nuclear magnetic resonance, and superconducting systems. Experimental detection and quantification of coherence, experimental state conversion and coherence distillation, and experiments investigating the dynamics of quantum coherence are then considered. Experiments exploring the connections between coherence and uncertainty relations, path information, and coherence of operations and measurements are also reviewed. Experimental efforts on multipartite and multilevel coherence are also discussed.

Cohering and decohering power of massive scalar fields under instantaneous interactions

“…Coherent systems, defined as existing in a superposition of different states, form the backbone of the second quantum revolution brought about by the advent of quantum information science and technology [1,2]. Formalized in terms of a quantum resource theory [3][4][5][6][7][8] the equivalence between coherence and entanglement (the fuel behind applications such as quantum dense coding [9], unhackable cryptography [10] and teleportation [11]) was recognized early on [12][13][14]. Recently, the role of coherence and its depletion during the execution of quantum algorithms has received increasing attention [15][16][17][18][19][20][21].…”

Lower Bound of $l_{1}$ Norm of Coherence of Bipartite Qubit-Qudit System and its Application in the Detection of Entangled Tripartite Qudit-Qubit-Qudit System

“…Thus, by seeing the vast scope of quantum coherence in different areas, we need to understand few fundamental aspects of this important phenomenon such as (i) detection of quantum coherence [12][13][14] (ii) quantification of quantum coherence [15][16][17][18] (iii) non-local advantage of coherence in performing quantum information processing task [19,20] and (iv) classification of different classes of entanglement in multipartite system using quantum coherence [21,22]. The recent development in the experiment for the detection and quantification of quantum coherence has been reviewed in [23]. In [24], H. Zhu et.al.…”

No-go theorems for deterministic purification and probabilistic enhancement of coherence

“…Thus, a critical issue is to investigate coherence manipulations via free operations. Many protocols of coherence manipulation have been proposed based on various physical scenarios [16,[42][43][44][45][46][47][48][49][50][51][52][53][54][55][56][57][58], and some have been demonstrated in the experiment [59][60][61][62].…”