Quantum 6, 849 (2022). https://doi.org/10.22331/q-2022-11-03-849 Effect algebras were introduced as an abstract algebraic model for Hilbert space effects representing quantum mechanical measurements. We study additional structures on an effect algebra $E$ that enable us to […]
Quantum 6, 848 (2022). https://doi.org/10.22331/q-2022-11-03-848 Preparing macroscopic mechanical resonators close to their motional quantum groundstate and generating entanglement with light offers great opportunities in studying fundamental physics and in developing a new generation of quantum […]
Quantum 6, 847 (2022). https://doi.org/10.22331/q-2022-10-25-847 Tracing out the environmental degrees of freedom is a necessary procedure when simulating open quantum systems. While being an essential step in deriving a tractable master equation it represents a […]
Quantum 6, 846 (2022). https://doi.org/10.22331/q-2022-10-25-846 Stabilizer states and graph states find application in quantum error correction, measurement-based quantum computation and various other concepts in quantum information theory. In this work, we study party-local Clifford (PLC) […]
Quantum 6, 845 (2022). https://doi.org/10.22331/q-2022-10-24-845 Quantum information science provides powerful technologies beyond the scope of classical physics. In practice, accurate control of quantum operations is a challenging task with current quantum devices. The implementation of […]
Quantum 6, 844 (2022). https://doi.org/10.22331/q-2022-10-20-844 We propose and investigate a new method of quantum process tomography (QPT) which we call projected least squares (PLS). In short, PLS consists of first computing the least-squares estimator of […]
Quantum 6, 843 (2022). https://doi.org/10.22331/q-2022-10-20-843 According to the entropy accumulation theorem, proving the unconditional security of a device-independent quantum key distribution protocol reduces to deriving tradeoff functions, i.e., bounds on the single-round von Neumann entropy […]
Quantum 6, 842 (2022). https://doi.org/10.22331/q-2022-10-20-842 This paper proposes a new factorization algorithm for computing the phase factors of quantum signal processing. The proposed algorithm avoids root finding of high degree polynomials by using a key […]
Quantum 6, 841 (2022). https://doi.org/10.22331/q-2022-10-17-841 The second law of thermodynamics uses change in free energy of macroscopic systems to set a bound on performed work. Ergotropy plays a similar role in microscopic scenarios, and is […]
Quantum 6, 840 (2022). https://doi.org/10.22331/q-2022-10-13-840 In contrast to interacting systems, the ground state of free systems has a highly ordered pattern of quantum correlations, as witnessed by Wick’s decomposition. Here, we quantify the effect of […]
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