Detecting Non-Markovianity via Quantified Coherence: Theory and Experiments

Experimental investigation of Markovian and non-Markovian channel addition

“…In the past, several works have studied this nonconvex geometry and introduced interesting examples where the addition of Markovian channels leads to a non-Markovian channel [20][21][22][23][24] and vice versa [25]. However, despite many experiments realising instances of quantum channels [26][27][28][29][30][31][32] and specifically non-Markovian channels [33][34][35][36][37], so far there has been no experimental investigation of the interesting phenomenon that adding Markovian channels can give rise to a non-Markovian channel, or the other way around.…”

Observing information backflow from controllable non-Markovian multi-channels in diamond

“…The information flow of a system to its environment usually induces a Markovian process, while the backflow of information from the environment exhibits non-Markovianity 6 . The practical environment, usually consisting of a large number of degrees of freedom, is hard to control, despite some attempts on controllable transitions from Markovian to non-Markovian dynamics [7][8][9][10][11][12] . Here, we experimentally demonstrate the engineering of multiple dissipative channels by controlling the adjacent nuclear spins of a nitrogen-vacancy centre in diamond.…”

Experimental demonstration of one-shot coherence distillation: High-dimensional state conversions

“…Instruction.-Quantum coherence, exhibiting the fundamental feature of quantum superposition, marks the departure of quantum physics from classical physics. Recently, problems of quantum coherence have attracted considerable attention because these are essential for quantum foundations [1][2][3][4][5][6][7][8][9][10][11][12] and could also have practical applications in a wide variety of fields, such as quantum cryptography, quantum simulations, thermodynamics, quantum metrology, transport theory, and quantum biology [13][14][15][16][17][18][19][20][21][22]. In order to characterize quantum coherence in a mathematically rigorous and physically meaningful framework, the resource theory of quantum coherence was developed [1,[23][24][25][26][27][28][29][30][31].…”