Quantum reverse-engineering and reference frame alignment without non-local correlations

Nonadiabatic geometric quantum computation with cat qubits via invariant-based reverse engineering

We propose a protocol to realize nonadiabatic geometric quantum computation of small-amplitude Schrödinger cat qubits via invariant-based reverse engineering. We consider a system with a two-photon driven Kerr nonlinearity, which provides a pair of dressed even and odd coherent states, i.e., Schrödinger cat states for fault-tolerant quantum computations. An additional coherent field is applied to linearly drive a cavity mode, to induce oscillations between dressed cat states. By designing this linear drive with invariant-based reverse engineering, nonadiabatic geometric quantum computation wit…

通过逆向工程优化非绝热几何量子计算

Optimized nonadiabatic holonomic quantum computation via reverse engineering

提出一种通用逆向工程方法，将非常规与优化的非绝热几何量子计算结合，通过选择耗时更短的演化路径加速循环演化，为未来实现高鲁棒量子计算提供灵活方案。

Trainmon：一个用于逆向工程超导量子比特势能的框架

Trainmon: a framework for reverse engineering potentials in superconducting Qubits

提出 Trainmon 框架，利用并联 Josephson 结支路和类离散余弦变换 Hamiltonian 逆向重构超导量子比特势阱，并在 Quarton、Fluxonium 上验证频率与相干时间。

Quantum reservoir engineering through quadratic optomechanical interaction in the reversed dissipation regime

We explore the electromagnetic field coupled to a mechanical resonator via quadratic optomechanical interaction in the reversed dissipation regime where the mechanical damping rate is much larger than the cavity field dissipation rate. It is shown that in this regime, the cavity field effectively acquires an additional reservoir which is conditioned by the temperature of the mechanical bath as well as the mechanical damping rate. We analytically find the steady-state mean photon number and the critical temperature of the mechanical oscillator to cool or heat the coupled electromagnetic field. …

Reverse engineering of a Hamiltonian by designing the evolution operators

We propose an effective and flexible scheme for reverse engineering of a Hamiltonian by designing the evolution operators to eliminate the terms of Hamiltonian which are hard to be realized in practice. Different from transitionless quantum driving (TQD) [31], the present scheme is focus on only one or parts of moving states in a D-dimension (D > 3) system. The numerical simulation shows that the present scheme not only contains the results of TQD, but also has more free parameters, which make this scheme more flexible. An example is given by using this scheme to realize the population transfe…

Reverse Engineering Quantum Field Theory

An approach to the foundations of quantum theory is advertised that proceeds by "reverse engineering" quantum field theory. As a concrete instance of this approach, the general boundary formulation of quantum theory is outlined.

Loss-tolerant quantum enhanced metrology and state engineering via the reverse Hong-Ou-Mandel effect

Preparing highly entangled quantum states between remote parties is a major challenge for quantum communications [1-8]. Particularly promising in this context are the N00N states, which are entangled N-photon wavepackets delocalized between two different locations, providing measurement sensitivity limited only by the uncertainty principle [1, 10-15]. However, these states are notoriously vulnerable to losses, making it difficult both to share them between remote locations, and to recombine them to exploit interference effects. Here we address this challenge by utilizing the reverse version of…

单比特量子门的逆向工程

Reverse engineering of single-qubit quantum gates

研究如何利用线性极化场设计单比特量子门，核心方法是通过调制正弦场并借助旋转波近似，经反转演化算符运动方程等步骤获取控制场公式，贡献是给出简单程序得封闭解析公式及相关可调参数。

Quantum Flux and Reverse Engineering of Quantum Wavefunctions

An interpretation of the probability flux is given, based on a derivation of its eigenstates and relating them to coherent state projections on a quantum wavefunction. An extended definition of the flux operator is obtained using coherent states. We present a "processed Husimi" representation, which makes decisions using many Husimi projections at each location. The processed Husimi representation reverse engineers or deconstructs the wavefunction, yielding the underlying classical ray structure. Our approach makes possible interpreting the dynamics of systems where the probability flux is uni…

Reverse quantum state engineering using electronic feedback loops

We propose an all-electronic technique to manipulate and control interacting quantum systems by unitary single-jump feedback conditioned on the outcome of a capacitively coupled electrometer and in particular a single-electron transistor. We provide a general scheme to stabilize pure states in the quantum system and employ an effective Hamiltonian method for the quantum master equation to elaborate on the nature of stabilizable states and the conditions under which state purification can be achieved. The state engineering within the quantum feedback scheme is shown to be linked with the soluti…

逆向转译：从电路快照中逆向工程量子编译器优化遍

Inverse-Transpilation: Reverse-Engineering Quantum Compiler Optimization Passes from Circuit Snapshots

本文提出基于机器学习的框架，通过分析原始与编译后量子电路的结构差异逆向推断优化技术，实验表明神经网络检测优化遍的F1分数高达0.96，揭示了编译器机密性面临的威胁。

AI驱动的QML模型逆向工程

AI-driven Reverse Engineering of QML Models

本文提出基于自编码器的方法，从部署在不可信第三方平台上的转译后QML模型中提取参数，在多量子比特分类器上实现平均误差约10^-1的逆向工程，且时间开销比先前暴力破解方法降低约100倍，揭示了QML知识产权面临的严重安全威胁。