One-shot rates for entanglement manipulation under non-entangling maps

Optimal operating conditions of an entangling two-transmon gate

We identify optimal operating conditions of an entangling two-qubit gate realized by a capacitive coupling of two superconducting charge qubits in a transmission line resonator (the so called "transmons"). We demonstrate that the sensitivity of the optimized gate to 1/f flux and critical current noise is suppressed to leading order. The procedure only requires a preliminary estimate of the 1/f noise amplitudes. No additional control or bias line beyond those used for the manipulation of individual qubits are needed. The proposed optimization is effective also in the presence of relaxation proc…

One-Shot Manipulation of Dynamical Quantum Resources

We develop a unified framework to characterize one-shot transformations of dynamical quantum resources in terms of resource quantifiers, establishing universal conditions for exact and approximate transformations in general resource theories. Our framework encompasses all dynamical resources represented as quantum channels, including those with a specific structure --- such as boxes, assemblages, and measurements --- thus immediately applying in a vast range of physical settings. For the particularly important manipulation tasks of distillation and dilution, we show that our conditions become …

One-shot manipulation of entanglement for quantum channels

We show that the dynamic resource theory of quantum entanglement can be formulated using the superchannel theory. In this formulation, we identify the separable channels and the class of free superchannels that preserve channel separability as free resources, and choose the swap channels as dynamic entanglement golden units. Our first result is that the one-shot dynamic entanglement cost of a bipartite quantum channel under the free superchannels is bounded by the standard log-robustness of channels. The one-shot distillable dynamic entanglement of a bipartite quantum channel under the free su…

再探单次纠缠操控的态与信道

Single-shot entanglement manipulation of states and channels revisited

该研究在单次框架下分析量子态与信道的纠缠蒸馏和稀释，借助转换距离推导纯态相关闭式表达式，给出混合态与信道的纠缠代价界，并定义纠缠相干信息给出单向蒸馏界。

动态量子资源理论中相干性的单次操控

One-shot manipulation of coherence in dynamic quantum resource theory

该研究基于超信道理论构建量子相干性动态资源理论，定义相关自由超信道与资源单位，建立动态相干代价与蒸馏的单次理论，引入δ-MISC超信道并给出单次催化动态相干代价的上下界。

通过拓扑波导纠缠两个巨型原子

Entangling two giant atoms via a topological waveguide

本文研究两个二能级巨型原子经 SSH 拓扑波导产生纠缠，分析16种耦合构型与主方程动力学，发现五对构型可显著增强纠缠的延迟突然出现。

Universal non-adiabatic geometric manipulation of pseudo-spin charge qubits

Reliable quantum information processing requires high-fidelity universal manipulation of quantum systems within the characteristic coherence times. Non-adiabatic holonomic quantum computation offers a promising approach to implement fast, universal, and robust quantum logic gates particularly useful in nano-fabricated solid-state architectures, which typically have short coherence times. Here, we propose an experimentally feasible scheme to realize high-speed universal geometric quantum gates in nano-engineered pseudo-spin charge qubits. We use a system of three coupled quantum dots containing…

One-Shot Coherence Dilution

Manipulation and quantification of quantum resources are fundamental problems in quantum physics. In the asymptotic limit, coherence distillation and dilution have been proposed by manipulating infinite identical copies of states. In the non-asymptotic setting, finite data-size effects emerge, and the practically relevant problem of coherence manipulation using finite resources has been left open. This letter establishes the one-shot theory of coherence dilution, which involves converting maximally coherent states into an arbitrary quantum state using maximally incoherent operations, dephasing…

One-shot dynamical resource theory

A fundamental problem in resource theory is to study the manipulation of the resource. Focusing on a general dynamical resource theory of quantum channels, here we consider tasks of one-shot resource distillation and dilution with a single copy of the resource. For any target of unitary channel or pure state preparation channel, we establish a universal strategy to determine upper and lower bounds on rates that convert between any given resource and the target. We show that the rates are related to resource measures based on the channel robustness and the channel hypothesis testing entropy, wi…

No second law of entanglement manipulation after all

Many fruitful analogies have emerged between the theories of quantum entanglement and thermodynamics, motivating the pursuit of an axiomatic description of entanglement akin to the laws of thermodynamics. A long-standing open problem has been to establish a true second law of entanglement, and in particular a unique function which governs all transformations between entangled systems, mirroring the role of entropy in thermodynamics. Contrary to previous promising evidence, here we show that this is impossible, and no direct counterpart to the second law of thermodynamics can be established. Th…

计算纠缠测度的性质

Efficient Entanglement Manipulation Cookbook: From Mixing to a Computational Second Law

本文系统分析两种计算纠缠测度的基本性质，引入上下界扩展，研究凸性、凹性、可加性及局部酉不变性，证明其仅在高效LOCC信道下为LOCC单调。