Quantum

Paper

Fast Black-Box Quantum State Preparation

Johannes Bausch,

Quantum 6, 773 (2022).

Quantum state preparation is an important ingredient for other higher-level quantum algorithms, such as Hamiltonian simulation, or for loading distributions into a quantum device to be used…

Paper

Deviation bounds and concentration inequalities for quantum noises

Tristan Benoist, Lisa Hänggli, and Cambyse Rouzé,

Quantum 6, 772 (2022).

We provide a stochastic interpretation of non-commutative Dirichlet forms in the context of quantum filtering. For stochastic processes motivated by quantum optics experiments, we derive an…

Paper

Security of quantum key distribution with detection-efficiency mismatch in the multiphoton case

Anton Trushechkin,

Quantum 6, 771 (2022).

Detection-efficiency mismatch is a common problem in practical quantum key distribution (QKD) systems. Current security proofs of QKD with detection-efficiency mismatch rely either on the as…

Paper

Towards Quantum Advantage in Financial Market Risk using Quantum Gradient Algorithms

Nikitas Stamatopoulos, Guglielmo Mazzola, Stefan Woerner, and William J. Zeng,

Quantum 6, 770 (2022).

We introduce a quantum algorithm to compute the market risk of financial derivatives. Previous work has shown that quantum amplitude estimation can accelerate derivative pricing quadraticall…

Paper

Measurement-based generation and preservation of cat and grid states within a continuous-variable cluster state

Miller Eaton, Carlos González-Arciniegas, Rafael N. Alexander, Nicolas C. Menicucci, and Olivier Pfister,

Quantum 6, 769 (2022).

We present an algorithm to reliably generate various quantum states critical to quantum error correction and universal continuous-variable (CV) quantum computing, such as Schrödinger cat sta…

Paper

TFermion: A non-Clifford gate cost assessment library of quantum phase estimation algorithms for quantum chemistry

Pablo A. M. Casares, Roberto Campos, and M. A. Martin-Delgado,

Quantum 6, 768 (2022).

Quantum Phase Estimation is one of the most useful quantum computing algorithms for quantum chemistry and as such, significant effort has been devoted to designing efficient implementations.…

Paper

Finite Rate QLDPC-GKP Coding Scheme that Surpasses the CSS Hamming Bound

Nithin Raveendran, Narayanan Rengaswamy, Filip Rozpędek, Ankur Raina, Liang Jiang, and Bane Vasić,

Quantum 6, 767 (2022).

Quantum error correction has recently been shown to benefit greatly from specific physical encodings of the code qubits. In particular, several researchers have considered the individual cod…

Paper

Quantum XYZ Product Codes

Anthony Leverrier, Simon Apers, and Christophe Vuillot,

Quantum 6, 766 (2022).

We study a three-fold variant of the hypergraph product code construction, differing from the standard homological product of three classical codes. When instantiated with 3 classical LDPC c…

Paper

Naturally restricted subsets of nonsignaling correlations: typicality and convergence

Pei-Sheng Lin, Tamás Vértesi, and Yeong-Cherng Liang,

Quantum 6, 765 (2022).

It is well-known that in a Bell experiment, the observed correlation between measurement outcomes – as predicted by quantum theory – can be stronger than that allowed by local causality, yet…

Paper

Statistical time-domain characterization of non-periodic optical clocks

Dario Cilluffo,

Quantum 6, 764 (2022).

Measuring time means counting the occurrence of periodic phenomena. Over the past centuries a major effort was put to make stable and precise oscillators to be used as clock regulators. Here…

Paper

Finding out all locally indistinguishable sets of generalized Bell states

Jiang-Tao Yuan, Ying-Hui Yang, and Cai-Hong Wang,

Quantum 6, 763 (2022).

In general, for a bipartite quantum system $\mathbb{C}^{d}\otimes\mathbb{C}^{d}$ and an integer $k$ such that $4\leq k\le d$,there are few necessary and sufficient conditions for local discriminat…

Paper

Work and Fluctuations: Coherent vs. Incoherent Ergotropy Extraction

Marcin Łobejko,

Quantum 6, 762 (2022).

We consider a quasi-probability distribution of work for an isolated quantum system coupled to the energy-storage device given by the ideal weight. Specifically, we analyze a trade-off betwe…

Paper

Computing Ground State Properties with Early Fault-Tolerant Quantum Computers

Ruizhe Zhang, Guoming Wang, and Peter Johnson,

Quantum 6, 761 (2022).

Significant effort in applied quantum computing has been devoted to the problem of ground state energy estimation for molecules and materials. Yet, for many applications of practical value,…

Paper

Entangled subspaces and generic local state discrimination with pre-shared entanglement

Benjamin Lovitz and Nathaniel Johnston,

Quantum 6, 760 (2022).

Walgate and Scott have determined the maximum number of generic pure quantum states that can be unambiguously discriminated by an LOCC measurement [Journal of Physics A: Mathematical and The…

Paper

The Quantum Approximate Optimization Algorithm and the Sherrington-Kirkpatrick Model at Infinite Size

Edward Farhi, Jeffrey Goldstone, Sam Gutmann, and Leo Zhou,

Quantum 6, 759 (2022).

The Quantum Approximate Optimization Algorithm (QAOA) is a general-purpose algorithm for combinatorial optimization problems whose performance can only improve with the number of layers $p$. W…

Paper

Divide-and-conquer verification method for noisy intermediate-scale quantum computation

Yuki Takeuchi, Yasuhiro Takahashi, Tomoyuki Morimae, and Seiichiro Tani,

Quantum 6, 758 (2022).

Several noisy intermediate-scale quantum computations can be regarded as logarithmic-depth quantum circuits on a sparse quantum computing chip, where two-qubit gates can be directly applied…

Category: Paper