QuCSI

Quantifying memory capacity as a quantum thermodynamic resource (Phys. Rev. Lett. 122, 060601)

The Szilard Engine presented the iconic example that related information theory and thermodynamics. In this engine, it was shown that when a demon is supplied with a 'blank tape' to record information, he could use it as a resource to do work. Here, we looked at what happens to such a demon when he is ... Read moreQuantifying memory capacity as a quantum thermodynamic resource (Phys. Rev. Lett. 122, 060601)

Memory-efficient tracking of complex temporal and symbolic dynamics with quantum simulators (New Journal of Physics 21, 013021)

We know from prior works that quantum models have an advantage when it comes to generating predictions, using less memory than all classical counterparts. This was first done in the context of processes that output symbols at discrete points in time. Subsequently similar advantages were discovered processes that can emit only a single symbol, but ... Read moreMemory-efficient tracking of complex temporal and symbolic dynamics with quantum simulators (New Journal of Physics 21, 013021)

Matrix Product States for Quantum Stochastic Modelling (Phys. Rev. Lett. 121, 260602)

There are many notions of complexity and structure. In computational mechanics, for example, the complexity of a stochastic process can be characterized by how much information one must store about its past to general future statistical predictions faithfully. Meanwhile, in quantum any body systems, a prominent measure of complexity is in the amount of information ... Read moreMatrix Product States for Quantum Stochastic Modelling (Phys. Rev. Lett. 121, 260602)

Operational Resource Theory of Continuous-Variable Nonclassicality (Phys. Rev. X 8, 041038)

Photons in the quantum realm behave very differently from the classical light experienced in our everyday lives. The concept of nonclassicality—one of the most influential ideas of twentieth-century quantum physics—draws a boundary between these two regimes. Nonclassical light is also a valuable resource, underpinning exciting technologies that exploit the peculiarities of quantum physics, including ultrasensitive ... Read moreOperational Resource Theory of Continuous-Variable Nonclassicality (Phys. Rev. X 8, 041038)

Operational resource theory of continuous-variable nonclassicality

Photons in the quantum realm behave very differently from the classical light experienced in our everyday lives. The concept of nonclassicality—one of the most influential ideas of twentieth-century quantum physics—draws a boundary between these two regimes. Nonclassical light is also a valuable resource, underpinning exciting technologies that exploit the peculiarities of quantum physics, including ultrasensitive ... Read moreOperational resource theory of continuous-variable nonclassicality

Geometry of quantum correlations in space-time (Phys. Rev. A 98, 052312)

One of the more interesting features of quantum mechanics is that correlations in space and correlation in time can be distinct. For example, if you have a Bell State, and measure each of the individual qubits in the Pauli Basis, you'll find that at most only two of the directions can be perfectly correlated - ... Read moreGeometry of quantum correlations in space-time (Phys. Rev. A 98, 052312)

Experimental Cyclic Interconversion between Coherence and Quantum Correlations (Physical review letters 121, 5, 050401)

Coherence and Discord are often thought as two distinct measures of non-classicality. The former a measure of non-classicality for single particles, the latter one for correlations. In this work, we designed an engineered experiment that illustrated how these resources can be inter-converted into each other. Experimental Cyclic Interconversion between Coherence and Quantum Correlations Kang-Da Wu, Zhibo ... Read moreExperimental Cyclic Interconversion between Coherence and Quantum Correlations (Physical review letters 121, 5, 050401)

Causal Asymmetry in a Quantum World (Phys. Rev. X 8, 0310)

The fundamental laws of physics work in the same way whether time moves forward or backward. Yet, while a glass can fall and scatter shards across the floor, glass shards never gather together and leap back onto the counter to form a complete glass. The source of this temporal asymmetry is one of the deepest ... Read moreCausal Asymmetry in a Quantum World (Phys. Rev. X 8, 0310)

Operational effects of the UNOT gate on classical and quantum correlations ( Science Bulletin 63, 12, 765-770)

The discrepancy communicating with parallel versus anti-parallel spins is one of the more surprising phenomena to arise in quantum theory.  That is, if Alice wants to send a direction to Bob. She can either send two spins pointing in this direction or one spin in this direction, while the other pointing in the diametric opposite. ... Read moreOperational effects of the UNOT gate on classical and quantum correlations ( Science Bulletin 63, 12, 765-770)

Practical Unitary Simulator for Non-Markovian Complex Processes (Phys. Rev. Lett. 120, 240502)

We knew that quantum mechanics can make correct future predictions by storing less information about the past, but how can these predictions be systematically generated? This was an important operational question, as we wanted to avoid situations where a quantum model requires only C bits of past information for predict at specific instances during prediction, ... Read morePractical Unitary Simulator for Non-Markovian Complex Processes (Phys. Rev. Lett. 120, 240502)