QuCSI

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)

Optimal Classical Simulation of State-Independent Quantum Contextuality (Phys. Rev. Lett. 120, 130401)

Quantum contextuality describes a form of non-classicality where the output of a quantum measurement C depends on which quantum measure, A or B, were made before -- even when A and B both commute with C and thus should each not disturb the measurement statistics of C. This phenomenon, however, can be replicated by a ... Read moreOptimal Classical Simulation of State-Independent Quantum Contextuality (Phys. Rev. Lett. 120, 130401)

Superior memory efficiency of quantum devices for the simulation of continuous-time stochastic processes (npj Quantum Information 4,18)

The basic idea here is how do we model processes that emit outputs at continuous points in time? If the process is Markovian (like the spontaneous emission of radiation), then things are easy - as we don't need to track how much time has elapse. But as soon as events turn out to be non-Markovian, ... Read moreSuperior memory efficiency of quantum devices for the simulation of continuous-time stochastic processes (npj Quantum Information 4,18)

Unification of non-classicality measures in interferometry (Physical Review A 97, 1, 012331)

There has being a growing interesting in the various features of quantum mechanics that are distinctly non-classical, from entanglement to discord to more recent ideas of coherence. Could these various forms of non-classicality be understood in a unified operation framework? In this piece of we work, we propose a way to do this in the context ... Read moreUnification of non-classicality measures in interferometry (Physical Review A 97, 1, 012331)

Quantum plug n' play: modular computation in the quantum regime (New Journal of Physics, 20, 013004)

The idea here is plug n' play: how can one quantum computer call upon another to perform a subroutine - without assuming anything about how the second computer was physical constructed? This becomes a very important question as the world builds towards scalable quantum computing - where two different parties wishes to work together to ... Read moreQuantum plug n' play: modular computation in the quantum regime (New Journal of Physics, 20, 013004)

Provably unbounded memory advantage in stochastic simulation using quantum mechanics (New Journal of Physics 19.10 103009)

It has been established that quantum models can provide a simpler description of most processes than the best possible classical model. However, the extent to which the quantum model can outperform the classical was an open question. In our article, “Provably unbounded memory advantage in stochastic simulation using quantum mechanics,” we answer this question and ... Read moreProvably unbounded memory advantage in stochastic simulation using quantum mechanics (New Journal of Physics 19.10 103009)