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View article: Efficient implementation of multicontrolled quantum gates
Efficient implementation of multicontrolled quantum gates Open
We present an implementation of multicontrolled () quantum gates that provides significant reductions of cost compared to state-of-the-art methods. The operator applied on the target qubit is a unitary, special unitary, or the Pauli X oper…
View article: Enhancing the energy gap of random graph problems via XX-catalysts in quantum annealing
Enhancing the energy gap of random graph problems via XX-catalysts in quantum annealing Open
One of the main challenges in solving combinatorial optimisation problems with quantum annealers is the emergence of extremely small energy gaps between the ground state and the first excited state of the annealing Hamiltonian. These small…
View article: Magnetic noise in macroscopic quantum spatial superpositions
Magnetic noise in macroscopic quantum spatial superpositions Open
In this paper, we will show how random fluctuations in the magnetic field will jitter the paths of a matter-wave interferometer randomly, hence, decohere the quantum superposition. To create a large spatial superposition with nanoparticles…
View article: Quantum Enhanced Sensitivity through Many-Body Bloch Oscillations
Quantum Enhanced Sensitivity through Many-Body Bloch Oscillations Open
We investigate the sensing capacity of non-equilibrium dynamics in quantum systems exhibiting Bloch oscillations. By focusing on the resource efficiency of the probe, quantified by quantum Fisher information, we find different scaling beha…
View article: Exponentially-enhanced quantum sensing with many-body phase transitions
Exponentially-enhanced quantum sensing with many-body phase transitions Open
View article: Geodesic algorithm for unitary gate design with time-independent Hamiltonians
Geodesic algorithm for unitary gate design with time-independent Hamiltonians Open
Larger multiqubit quantum gates allow shallower, more efficient quantum circuits, which could decrease the prohibitive effect of noise on algorithms for noisy intermediate-scale quantum (NISQ) devices and fault-tolerant error correction sc…
View article: Quantum Liang Information Flow Probe of Causality across Critical Points
Quantum Liang Information Flow Probe of Causality across Critical Points Open
Investigating causation in the quantum domain is crucial. Despite numerous studies of correlations in quantum many-body systems, causation, which is very distinct from correlations, has hardly been studied. We address this by demonstrating…
View article: Ballistic entanglement cloud after a boundary quench
Ballistic entanglement cloud after a boundary quench Open
Entanglement has been extensively used to characterize the structure of strongly correlated many-body systems. Most of these analyses focus on either spatial properties of entanglement or its temporal behavior. Negativity, as an entangleme…
View article: Inertial torsion noise in matter-wave interferometers for gravity experiments
Inertial torsion noise in matter-wave interferometers for gravity experiments Open
Matter-wave interferometry is susceptible to noninertial noise sources, which can induce dephasing and a resulting loss of interferometric visibility. Here, we focus on inertial torsion noise (ITN), which arises from the rotational motion …
View article: Relativistic dips in entangling power of gravity
Relativistic dips in entangling power of gravity Open
The salient feature of both classical and quantum gravity is its universal and attractive character. However, less is known about the behavior and build-up of quantum correlations when quantum systems interact via graviton exchange. In thi…
View article: Robustness of diabatic enhancement in quantum annealing
Robustness of diabatic enhancement in quantum annealing Open
In adiabatic quantum annealing, the speed with which an anneal can be run, while still achieving a high final ground state (GS) fidelity, is dictated by the size of the minimum gap that appears between the ground and first excited state in…
View article: Rotational stability in nanorotor and spin contrast in one-loop interferometry in the Stern-Gerlach setup
Rotational stability in nanorotor and spin contrast in one-loop interferometry in the Stern-Gerlach setup Open
The rotation of a nanoparticle in a quantum system has many applications, from theory to experiments. This paper will treat nanoparticle rotational dynamics for spin-embedded nanorotors. We will model it as a rigid body that properly treat…
View article: Exponentially-enhanced quantum sensing with many-body phase transitions
Exponentially-enhanced quantum sensing with many-body phase transitions Open
Quantum sensors based on critical many-body systems are known to exhibit enhanced sensing capability. Such enhancements typically scale algebraically with the probe size. Going beyond algebraic advantage and reaching exponential scaling ha…
View article: Diamagnetic microchip traps for levitated nanoparticle entanglement experiments
Diamagnetic microchip traps for levitated nanoparticle entanglement experiments Open
The Quantum Gravity Mediated Entanglement (QGEM) protocol offers a novel method to probe the quantumness of gravitational interactions at non-relativistic scales. This protocol leverages the Stern-Gerlach effect to create $\mathcal{O}(\sim…
View article: Testing Whether Gravity Acts as a Quantum Entity When Measured
Testing Whether Gravity Acts as a Quantum Entity When Measured Open
A defining signature of classical systems is “in principle measurability” without disturbance: a feature manifestly violated by quantum systems. We describe a multi-interferometer experimental setup that can, in principle, reveal the noncl…
View article: Decoherence rate expression due to air molecule scattering in spatial qubits
Decoherence rate expression due to air molecule scattering in spatial qubits Open
We provide a solution for decoherence in spatial superpositions due to scattering/collision with air molecules. This result reproduces the short- and long-wavelength limits known in the literature. We compare the decoherence rate with seve…
View article: Phonon-induced contrast in a matter-wave interferometer
Phonon-induced contrast in a matter-wave interferometer Open
Utilizing the Stern-Gerlach apparatus to create matter-wave superposition states is a long-sought-after goal, not only due to its potential applications in the quantum realm, but also because of its fundamental implications for studying th…
View article: Exponentially-enhanced quantum sensing with many-body phase transitions
Exponentially-enhanced quantum sensing with many-body phase transitions Open
Quantum sensors based on critical many-body systems are known to exhibit enhanced sensing capability. Such enhancements typically scale algebraically with the probe size. Going beyond algebraic advantage and reaching exponential scaling ha…
View article: Effects of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>X</mml:mi><mml:mi>X</mml:mi></mml:mrow></mml:math> catalysts on quantum annealing spectra with perturbative crossings
Effects of catalysts on quantum annealing spectra with perturbative crossings Open
In adiabatic quantum computation the required run-time to reach a given ground-state fidelity is dictated by the size of the minimum gap that appears between the ground and first-excited state in the annealing spectrum. In general the pres…
View article: Quantum spatial search with multiple excitations
Quantum spatial search with multiple excitations Open
Spatial search is the problem of finding a marked vertex in a graph. A continuous-time quantum walk in the single-excitation subspace of an $n$ spin system solves the problem of spatial search by finding the marked vertex in $O(\sqrt{n})$ …
View article: Enhancing the Energy Gap of Random Graph Problems via XX-catalysts in Quantum Annealing
Enhancing the Energy Gap of Random Graph Problems via XX-catalysts in Quantum Annealing Open
One of the bottlenecks in solving combinatorial optimisation problems using quantum annealers is the emergence of exponentially-closing energy gaps between the ground state and the first excited state during the annealing, which indicates …
View article: Exponential speed-up of quantum annealing via n-local catalysts
Exponential speed-up of quantum annealing via n-local catalysts Open
The quantum speedup in solving optimization problems via adiabatic quantum annealing is often hindered by the closing of the energy gap during the anneal, especially when this gap scales exponentially with system size. In this work, we add…
View article: Relativistic effects on entangled single-electron traps
Relativistic effects on entangled single-electron traps Open
The manipulation of individual charged particles has been deeply explored in physics’s theoretical and experimental domains during the past decades. It is the pillar of several existing devices used for metrology and sensing and is a promi…
View article: Dark matter searches with levitated sensors
Dark matter searches with levitated sensors Open
Motivated by the current interest in employing quantum sensors on Earth and in space to conduct searches for new physics, we provide a perspective on the suitability of large-mass levitated optomechanical systems for observing dark matter …
View article: Exponential Expansion of Massive Schrödinger Cats for Sensing and Entanglement
Exponential Expansion of Massive Schrödinger Cats for Sensing and Entanglement Open
Schrödinger cat states of levitated masses have several applications in sensing and, offer an avenue to explore the fundamental nature -- classical vs nonclassical -- of gravity, eg, through gravitationally induced entanglement (GIE). The …
View article: Dephasing due to electromagnetic interactions in spatial qubits
Dephasing due to electromagnetic interactions in spatial qubits Open
Matter-wave interferometers with microparticles will enable the next generation of quantum sensors to probe minute quantum phase information. Therefore, estimating the loss of coherence and the degree of entanglement degradation for such i…
View article: Dynamics of many-body localized systems: logarithmic lightcones and $\log \, t$-law of $α$-Rényi entropies
Dynamics of many-body localized systems: logarithmic lightcones and $\log \, t$-law of $α$-Rényi entropies Open
In the context of the Many-Body-Localization phenomenology we consider arbitrarily large one-dimensional local spin systems, the XXZ model with random magnetic field is a prototypical example. Without assuming the existence of exponentiall…
View article: The dynamical $α$-Rényi entropies of local Hamiltonians grow at most linearly in time
The dynamical $α$-Rényi entropies of local Hamiltonians grow at most linearly in time Open
We consider a generic one dimensional spin system of length $ L $, arbitrarily large, with strictly local interactions, for example nearest neighbor, and prove that the dynamical $ α$-Rényi entropies, $ 0 < α\le 1 $, of an initial product …
View article: Gyroscopic stability for nanoparticles in Stern-Gerlach Interferometry and spin contrast
Gyroscopic stability for nanoparticles in Stern-Gerlach Interferometry and spin contrast Open
Creating macroscopic spatial quantum superposition with a nanoparticle has a multitude of applications, ranging from testing the foundations of quantum mechanics, matter-wave interferometer for detecting gravitational waves and probing the…
View article: Relativistic Effects on Entangled Single-Electron Traps
Relativistic Effects on Entangled Single-Electron Traps Open
The manipulation of individual charged particles has been deeply explored in physics's theoretical and experimental domains during the past decades. It is the pillar of several existing devices used for metrology and sensing and is a promi…