QuCSI

Energetic Advantages for Quantum Agents in Online Execution of Complex Strategies (Phys. Rev. Lett. 135, 160402)

In this article, we asked: ”Can an agent equipped with quantum memory fundamentally exhibit an energetic advantage over its classical counterparts?“ What we found is that for autonomous agents, there exists a fundamental dissipative energetic cost arising from the need to be ready for every possible contingency. As an analogy, imagine preparing for a day ... Read moreEnergetic Advantages for Quantum Agents in Online Execution of Complex Strategies (Phys. Rev. Lett. 135, 160402)

Undecidability in Physics: A Review（Physics Reports 1138, 1–29）

Some questions are hard because we have not yet found the right method. Others are hard in a deeper sense: no algorithm can solve them in full generality. This idea, known as undecidability, began in mathematics and computer science with the work of Gödel, Church, and Turing. It shows that even with perfect logic and ... Read moreUndecidability in Physics: A Review（Physics Reports 1138, 1–29）

Dimension reduction in quantum sampling of stochastic processes (npj Quantum Information volume 11, 34)

Many problems in science, engineering, and finance involve generating samples from complex probability distributions. Classically, such samples are usually the end of the story: one draws random outcomes and then analyzes them. Quantum samples are more powerful. By encoding many possible outcomes coherently in a quantum state, they can be passed directly into other quantum ... Read moreDimension reduction in quantum sampling of stochastic processes (npj Quantum Information volume 11, 34)

Thermodynamically Ideal Quantum State Inputs to Any Device (PRX Quantum 5, 030318)

Thermodynamics set limits on what machines can do: how much work they can produce, how much heat they release, and how much energy is wasted. But for microscopic and quantum devices, there is another equally important question: what state is fed into the machine in the first place? A quantum device generally works optimally for ... Read moreThermodynamically Ideal Quantum State Inputs to Any Device (PRX Quantum 5, 030318)

Relative Entropy of Coherence Quantifies Performance in Bayesian Metrology (PRX Quantum 5, 030303)

Quantum sensors aim to reveal tiny hidden signals, such as small shifts in light, magnetic fields, time, or motion. Their power often comes from one of the strangest features of quantum physics: superposition, where a system can occupy multiple possibilities at once. This quantum “coherence” can carry valuable information about the signal being measured. Yet ... Read moreRelative Entropy of Coherence Quantifies Performance in Bayesian Metrology (PRX Quantum 5, 030303)

Virtual Quantum Resource Distillation (Phys. Rev. Lett. 132, 050203)

Ideal quantum resources, such as Bell States for Entanglement or Magic States of quantum error corrections, are ket to enable useful quantum technologies. However, in many instances, experimental imperfections make it impossible to engineer such states exactly. Quantum resource distillation represents a class protocol aimed to remedy this, converting many copies of imperfect quantum states ... Read moreVirtual Quantum Resource Distillation (Phys. Rev. Lett. 132, 050203)

Quantum-optimal information encoding using noisy passive linear optics (Quantum 8, 1218)

Determining the maximal amount of information that can be reliably transmitted through a noisy channel is a key question in information theory. This study delves into a class of optical quantum channels that stand out for their practicality: they do not require an external energy source for their operation. By focusing on these channels, the ... Read moreQuantum-optimal information encoding using noisy passive linear optics (Quantum 8, 1218)

Universal Sampling Lower Bounds for Quantum Error Mitigation (Phys. Rev. Lett. 131, 210602)

Quantum computing holds tremendous promise but is hindered by the pervasive influence of noise on the delicate quantum states. Various strategies have been devised to mitigate these errors in the absence of error correction, yet it remains unclear when such methods are sufficient. Here, we consider the fundamental sampling cost, i.e., the number of iterations ... Read moreUniversal Sampling Lower Bounds for Quantum Error Mitigation (Phys. Rev. Lett. 131, 210602)

Quantum Uncertainty Principles for Measurements with Interventions (Phys. Rev. Lett. 130, 240201)

Interactive measurements represent the most powerful way in which agents can learn about their environments. When toddlers want to understand cause and effect for example, they don't merely observe. Instead they try different actions, and observe the reactions. This interactivity is key to learning the causal relations between objects. As such, in Artificial intelligence and ... Read moreQuantum Uncertainty Principles for Measurements with Interventions (Phys. Rev. Lett. 130, 240201)

Implementing quantum dimensionality reduction for non-Markovian stochastic simulation (Nat Commun 14, 2624)

Complex systems such as traffic patterns weather forecasts, and financial markets are ‘stochastic’ processes typically modelled by storing vast amounts of information about events in the past – which quickly consumes lots of memory. The downside of of this is not only resource cost. The more things a model tracks, the harder it is to ... Read moreImplementing quantum dimensionality reduction for non-Markovian stochastic simulation (Nat Commun 14, 2624)