Giuseppe Nisticó
In this work we show that in double-slit experiment properties incompatible with Which Slit property can be detected without erasing the knowledge of which slit each particle passes through and without affecting the point of impact on the final screen. A systematic procedure to find these particular properties is provided. A thought experiment which realizes this detection is proposed.
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It was pointed out in the first part of this study that EPR-type entanglement is defined by the possibility of performing any of two mutually incompatible distant, i. e.,direct-interaction-free, measurements. They go together under the term 'EPR-type disentanglement'. In this second part, quantum-mechanical insight is gained in the real random delayed-choice erasure experiment of Kim et al. [Kim et al.: Phys. Rev. Lett. 84, 1-5 (2000)] by a relative-reality-of- unitarily-evolving-state (RRUES) approach (explained in the first part). Finally, it is shown that this remarkable experiment, which p…
A biased-erasure cavity qubit with hardware-efficient quantum error detection
该研究实现了一种硬件高效的偏置擦除量子比特，通过逻辑测量和中电路擦除检测，实现了低于1%的逻辑态分配误差和显著的相干增益，为容错量子计算提供了新的平台。
Fast, High-Fidelity Erasure Detection of Dual-Rail Qubits with Symmetrically Coupled Readout
本文提出一种快速、高保真且可扩展的双轨量子比特擦除检测方法，通过单个读出谐振器对称耦合双轨量子比特，实现384ns内单次擦除检测，显著降低误差率。
Hardware-efficient erasure-error detection with an integer fluxonium
本研究利用整数磁通量子比特，无需辅助量子比特实现硬件高效的擦除错误检测，通过丢弃擦除事件大幅提升量子态寿命与门性能，为量子纠错提供了新平台。
In a typical two-slits experiments we face the question whether it is possible or not to attain knowledge about properties incompatible with Which-Slit property together with the measurement of the final impact point. A wide family of solutions is concretely found and an ideal experiment realizing such a detection is designed, relatively to the detection of three such incompatible properties. In the case of four incompatible properties, general conditions for the existence of solutions are singled out and a particular family of solutions is provided.
We exploit the notion of which-slit detector introduced by Englert, Scully and Walther (ESW), to show that two incompatible properties can be detected together for each particle hitting the screen, without disturbing the center-of-mass motion of the particle.
Erasure detection of a dual-rail qubit encoded in a double-post superconducting cavity
本文在双柱超导腔中实现双轨量子比特，利用辅助transmon进行擦除检测，并通过改进的联合Wigner层析成像表征码空间，测得擦除率远高于残余退相干率，展示了该架构在量子纠错中的潜力。
Erasure conversion in Majorana qubits via local quasiparticle detection
提出基于局域准粒子检测的 Majorana 量子比特擦除转换方案，利用稳定子码将大部分 Pauli 错误转为可由外码处理的擦除错误，并提高准粒子中毒阈值。
Hardware-Efficient Erasure Qubits With Superconducting Transmon Qutrits
本文提出一种利用超导传输门三量子比特作为擦除量子比特的高效硬件方案，通过检测主控量子比特的退相干误差，实现了超过500微秒的逻辑量子比特寿命，并展示了双用途辅助量子比特在擦除检测和奇偶校验中的应用。
Double-slit experiment very well lends itself in describing the problem of measuring simultaneously incompatible properties. In such a context, we theoretically design an ideal experiment for spin-7/2 particles, able to produce the entanglement which makes possible the detection.
High-fidelity all-microwave CZ gate with partial erasure-error detection via a transmon coupler
本文提出并实验演示了一种基于固定频率 transmon 耦合器和多路径耦合的全微波 CZ 门方案，通过色散频移诱导几何相位实现高保真门操作，同时抑制残余 ZZ 相互作用，并利用门后耦合器状态测量实现部分擦除错误检测，以支持擦除感知的量子纠错。
Demonstration of Erasure Conversion in a Molecular Tweezer Array
本文在分子光镊阵列中展示了位点分辨的内部状态错误检测和量子擦除技术，实现了高保真阵列制备、中途擦除检测及黑体辐射错误向擦除的转换，有助于降低容错量子纠错开销。
The uncertainty relation is one of the key ingredients of quantum theory. Despite the great efforts devoted to this subject, most of the variance-based uncertainty relations are state-dependent and suffering from the triviality problem of zero lower bounds. Here we develop a method to get uncertainty relations with state-independent lower bounds. The method works by exploring the eigenvalues of a Hermitian matrix composed by Bloch vectors of incompatible observables and is applicable for both pure and mixed states and for arbitrary number of N- dimensional observables. The uncertainty relation…
Pauli Manipulation Detection codes and Applications to Quantum Communication over Adversarial Channels
本文提出高概率检测任意Pauli错误的PMD码，并结合稳定子码与经典不可延展码，构造接近量子Singleton界的擦除纠错码及免密钥逐量子比特认证码。
The Floquet Fluxonium Molecule: Driving Down Dephasing in Coupled Superconducting Qubits
本文提出一种受驱动的超导擦除量子比特——Floquet 磁通量子分子，通过分离量子比特态和二阶通量噪声不敏感机制，实现约50毫秒相干时间和约500微秒擦除寿命，并展示高保真单量子比特门操作方案。
We report a quantum eraser experiment which actually uses a Young double-slit to create interference. The experiment can be considered an optical analogy of an experiment proposed by Scully, Englert and Walther. One photon of an entangled pair is incident on a Young double-slit of appropriate dimensions to create an interference pattern in a distant detection region. Quarter-wave plates, oriented so that their fast axes are orthogonal, are placed in front of each slit to serve as which-path markers. The quarter-wave plates mark the polarization of the interfering photon and thus destroy the in…
We discuss recent developments in measurement protocols that generate quantum entanglement between two remote qubits, focusing on the theory of joint continuous detection of their spontaneous emission. We consider a device geometry similar to that used in well-known Bell-state measurements, which we analyze using a conceptually transparent model of stochastic quantum trajectories; we use this to review photodetection, the most straightforward case, and then generalize to the diffusive trajectories from homodyne and heterodyne detection as well. Such quadrature measurement schemes are a realist…
Error-detection and correction are necessary prerequisites for any scalable quantum computing architecture. Given the inevitability of unwanted physical noise in quantum systems and the propensity for errors to spread as computations proceed, computational outcomes can become substantially corrupted. This observation applies regardless of the choice of physical implementation. In the context of photonic quantum information processing, there has recently been much interest in passive linear optics quantum computing, which includes boson-sampling, as this model eliminates the highly-challenging …
Rabi oscillations of a two-level atom appear as a quantum interference effect between the amplitudes associated to atomic superpositions, in analogy with the classic double-slit experiment which manifests a sinusoidal interference pattern. By extension, through direct detection of time-resolved resonance fluorescence from a quantum-dot neutral exciton driven in the Rabi regime, we experimentally demonstrate triple-slit-type quantum interference via quantum erasure in a V-type three-level artificial atom. This result is of fundamental interest in the experimental studies of the properties of V-…
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