Anupam Mazumdar
YOU?
Author Swipe
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: Evolution of tripartite entanglement in three-qubit Quantum Gravity-Induced Entanglement of Masses (QGEM) with quantum decoherence
Evolution of tripartite entanglement in three-qubit Quantum Gravity-Induced Entanglement of Masses (QGEM) with quantum decoherence Open
The recently introduced quantum gravity-induced entanglement of masses (QGEM) protocol aims to test the quantum nature of gravity by witnessing the entanglement produced by the virtual exchange of a graviton between two spatially superpose…
View article: Destructive Interference of Inertial Noise in Matter-wave Interferometry
Destructive Interference of Inertial Noise in Matter-wave Interferometry Open
Matter-wave interferometry is highly susceptible to inertial acceleration noises arising from the vibration of the experimental apparatus. There are various methods for noise suppression. In this paper, we propose leveraging the cross-corr…
View article: Manifestation of quantum entanglement between harmonic oscillators in de Sitter
Manifestation of quantum entanglement between harmonic oscillators in de Sitter Open
Two harmonic oscillators interacting through the exchange of a quantum field leads to non-zero entanglement between the two, which is absent for classical interaction. In this work, we determine the entanglement between two such harmonic o…
View article: Spin-dependent force and inverted harmonic potential for rapid creation of macroscopic quantum superpositions
Spin-dependent force and inverted harmonic potential for rapid creation of macroscopic quantum superpositions Open
Creating macroscopic spatial superposition states is crucial for investigating matter-wave interferometry and advancing quantum sensor technology. Currently, two potential methods exist to achieve this objective. The first involves using i…
View article: Spin contrast, finite temperature, and noise in matter-wave interferometer
Spin contrast, finite temperature, and noise in matter-wave interferometer Open
In this paper, we will show how finite-temperature corrections and spin-dependent/independent noise will affect the contrast in a matter-wave interferometer, especially with massive objects and large spatial superposition sizes. Typically,…
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: The Weinberg no-go theorem for cosmological constant and nonlocal gravity
The Weinberg no-go theorem for cosmological constant and nonlocal gravity Open
We show how a nonlocal gravitational interaction can circumvent the Weinberg no-go theorem on cosmological constant, which forbids the existence of any solution to the cosmological constant problem within the context of local field theorie…
View article: Genuine tripartite entanglement in graviton-matter interactions
Genuine tripartite entanglement in graviton-matter interactions Open
We demonstrate the existence of genuine tripartite non-Gaussian entanglement in a quantum gravitational system formed by a quantum harmonic oscillator coupled to a single frequency of a quantized gravitational wave. For this purpose, we in…
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: Parameter scanning in a quantum-gravity-induced entanglement of masses (QGEM) experiment with electromagnetic screening
Parameter scanning in a quantum-gravity-induced entanglement of masses (QGEM) experiment with electromagnetic screening Open
Witnessing the quantum nature of spacetime is an exceptionally challenging task. However, the quantum gravity-induced entanglement of matter (QGEM) protocol proposes such a test by testing entanglement between adjacent matter-wave interfer…
View article: The Weinberg no-go theorem for cosmological constant and nonlocal gravity
The Weinberg no-go theorem for cosmological constant and nonlocal gravity Open
We show how a nonlocal gravitational interaction can circumvent the Weinberg no-go theorem on cosmological constant, which forbids the existence of any solution to the cosmological constant problem within the context of local field theorie…
View article: Smearing out contact terms in ghost-free infinite derivative quantum gravity
Smearing out contact terms in ghost-free infinite derivative quantum gravity Open
In the context of ghost-free infinite derivative gravity, we consider the single graviton exchange between two spinless particles, a spinless particle and a photon, or between a spinless particle and a spin-1/2 particle. To this end, we co…
View article: Magnetic field fluctuations induced decoherence of a diamagnetic nanosphere
Magnetic field fluctuations induced decoherence of a diamagnetic nanosphere Open
This paper provides a simple derivation of the decoherence rate for a diamagnetic nanoparticle in the presence of fluctuations of the magnetic field in a thermal environment. Diamagnetic levitation is one of the key techniques for trapping…
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: Genuine tripartite entanglement in graviton-matter interactions
Genuine tripartite entanglement in graviton-matter interactions Open
We demonstrate the existence of genuine tripartite non-Gaussian entanglement in a quantum gravitational system formed by a quantum harmonic oscillator coupled to a single frequency of a quantized gravitational wave. For this purpose, we in…
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: 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: Gravitational-wave background in bouncing models from semi-classical, quantum and string gravity
Gravitational-wave background in bouncing models from semi-classical, quantum and string gravity Open
We study the primordial spectra and the gravitational-wave background (GWB) of three models of semi-classical, quantum or string gravity where the big bang is replaced by a bounce and the primordial tensor spectrum is blue: ekpyrotic unive…
View article: Spin-Dependent Force and Inverted Harmonic Potential for Rapid Creation of Macroscopic Quantum Superpositions
Spin-Dependent Force and Inverted Harmonic Potential for Rapid Creation of Macroscopic Quantum Superpositions Open
Creating macroscopic spatial superposition states is crucial for investigating matter-wave interferometry and advancing quantum sensor technology. Currently, two potential methods exist to achieve this objective. The first involves using i…
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: 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…
View article: Gravitational-wave background in bouncing models from semi-classical, quantum and string gravity
Gravitational-wave background in bouncing models from semi-classical, quantum and string gravity Open
We study the primordial spectra and the gravitational-wave background (GWB) of three models of semi-classical, quantum or string gravity where the big bang is replaced by a bounce and the primordial tensor spectrum is blue: ekpyrotic unive…
View article: Can nonlocal gravity really explain dark energy?
Can nonlocal gravity really explain dark energy? Open
In view to scrutinize the idea that nonlocal modifications of General Relativity could dynamically address the dark energy problem, we investigate the evolution of the Universe at infrared scales as an Infinite Derivative Gravity model of …
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 behaviour and build-up of quantum correlations when quantum systems interact via graviton exchange. In th…