Quantum 6, 852 (2022). https://doi.org/10.22331/q-2022-11-03-852 Quantum chaos cannot develop faster than $lambda leq 2 pi/(hbar beta)$ for systems in thermal equilibrium [Maldacena, Shenker & Stanford, JHEP (2016)]. This `MSS bound’ on the Lyapunov exponent $lambda$ […]
Quantum 6, 851 (2022). https://doi.org/10.22331/q-2022-11-03-851 In this work, the concept of mutually unbiased frames is introduced as the most general notion of unbiasedness for sets composed by linearly independent and normalized vectors. It encompasses the […]
Quantum 6, 850 (2022). https://doi.org/10.22331/q-2022-11-03-850 Symmetric quantum signal processing provides a parameterized representation of a real polynomial, which can be translated into an efficient quantum circuit for performing a wide range of computational tasks on […]
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 […]
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