Abstract The quantization of gravity is widely believed to result in gravitons – particles discrete energy that form gravitational waves. But their detection has so far been considered impossible. Here we show signatures single graviton exchange can be observed laboratory experiments. We stimulated and spontaneous single-graviton processes become relevant for massive quantum acoustic resonators absorption resolved through continuous sensing jumps. analyze the feasibility observing quanta...

We provide the first experimental confirmation of a three-way quantum coherence identity possessed by single pure-state photons. Our results demonstrate that traditional wave-particle duality is specifically limited this identity. As new consequence, we show itself can be amplified, attenuated, or turned completely off. In Young double-slit context found to directly relevant, and it supplies rare quantitative backup for one Bohr's philosophical pronouncements.

We propose a quantum harmonic oscillator measurement engine fueled by simultaneous measurements of the noncommuting position and momentum quadratures oscillator. The extracts work moving trap suddenly, conditioned on outcomes. present two protocols for extraction, respectively based single-shot time-continuous measurements. In limit, is measured in coherent state basis; adds an average one energy to oscillator, which then extracted feedback step. continuous weak both result state, whose...

While quantum measurements have been shown to constitute a resource for operating thermal machines, the nature of energy exchanges involved in interaction between system and measurement apparatus is still under debate. In this work, we show that microscopic model necessary unambiguously determine whether provide form heat or work. We illustrate result by considering measurement-based refrigerator, made double dot embedded two-terminal device, with charge one dots being continuously...

We propose simple quantitative criteria, based on counting statistics in resonant harmonic detectors, that probe the quantum mechanical character of radiation fields. They provide, particular, practical means to test null hypothesis a given field is “maximally classical,” i.e., accurately described by coherent state. suggest circumstances which plausibly fails, notably including gravitational involving nonlinear or stochastic sourcing. Published American Physical Society 2025

Abstract Among the different platforms for quantum information processing, individual electron spins in semiconductor dots stand out their long coherence times and potential scalable fabrication. The past years have witnessed substantial progress capabilities of spin qubits. However, coupling between distant spins, which is required error correction, presents a challenge, this goal remains focus intense research. Quantum teleportation canonical method to transmit qubit states, but it has not...

Fluctuation theorems are relations constraining the out-of-equilibrium fluctuations of thermodynamic quantities like entropy production that were initially introduced for classical or quantum systems in contact with a thermal bath. Here we show, absence bath, dynamics continuously measured can also be described by fluctuation theorem, expressed terms recently arrow time measure. This theorem captures emergence irreversible behavior from microscopic reversibility continuous measurements. From...

Abstract The origin of macroscopic irreversibility from microscopically time-reversible dynamical laws—often called the arrow-of-time problem—is fundamental interest in both science and philosophy. Experimentally probing such questions quantum theory requires systems with near-perfect isolation environment long coherence times. Ultracold atoms are uniquely suited to this task. We experimentally demonstrate a striking parallel between statistical wavefunction collapse arrow time problem weak...

Abstract A combined theoretical and experimental investigation into the role of concerted long‐ (dipole coupling) short‐range (orbital overlap mediated excimer) electronic interactions in modulating emission six crystalline acetylanthracenes ( 1 – 3 ) is reported. Friedel–Crafts acylation anthracene rendered with discrete close packing, varied orbital overlap, resultant distinct (blue–green–yellow) from cooperative excimer dipole coupling. Time‐resolved spectroscopy (TRES) studies Kasha's...

We propose a quantum absorption refrigerator using the physics of resonant tunneling through dots. The cold and hot reservoirs are fermionic leads, tunnel coupled via dots to central cavity, we configurations in which heat absorbed from (very hot) cavity is used as resource selectively transfer reservoir on left right. Heat transport device particle-hole symmetric; find two regimes cooling function dot energies---symmetric with respect Fermi energy reservoirs---and associate them by...

We propose an optimal protocol using phase-preserving quantum measurements and phase-dependent modulations of the trapping potential at parametric resonance to cool a oscillator occupation number less than one quantum. derive phase relationship duration for compute lowest-possible in steady state. The is robust against moderate amounts dissipation errors feedback loop. Our work has implications cooling levitated mechanical resonators regime.

Here we explore the possibility of precise time keeping in quantum systems using athermal resources. We show that measurement engineered reservoirs can be used as resources to drive ticks a clock. Two- and three-level act transducers our model, converting measurement-induced noise produce series ticks. The ticking rate clock is maximized when measured observable maximally noncommutes with clock's Hamiltonian. use large deviation principle characterize statistics observed within given period...

We propose cyclic refrigeration in solid state, employing a gas of magnetic field vortices type-II superconductor---also known as fluxons---as the cooling agent. Refrigeration cycles are realized by envisioning racetrack geometry consisting both adiabatic and isothermal arms, etched into superconductor. The guided propagation fluxons is achieved applying an external electrical current, Corbino geometry, through sample. A gradient set across allowing one to adiabatically cool down heat up...

We propose a solid state refrigeration technique based on repeated adiabatic magnetization/demagnetization cycles of superconductor which acts as the working substance. The gradual cooling down substrate (normal metal) in contact with substance is demonstrated for different initial temperatures substrate. Excess heat given to hot large-gap superconductor. on-chip refrigerator works cyclic manner because an effective thermal switching mechanism: Heat transport between N/N versus N/S junctions...

In a single-qubit weak-measurement-based device, one may imagine feedback control as conducted by quantum Maxwell's demon. Here, the authors investigate both discrete and continuous measurements in such device order to connect work entropy statistics demon's perceived arrow of time.

We establish an analogy between superconductor-metal interfaces and the quantum physics of a black hole, using proximity effect. show that metal-superconductor interface can be thought as event horizon Andreev reflection from is analogous to Hawking radiation in holes. describe information transfer with final state projection model similar Horowitz-Maldacena for hole evaporation. also propose reflection-analogue Hayden Preskill's description state, where described mirror. The Crossed...

We discuss recent developments in measurement protocols that generate quantum entanglement between two remote qubits, focusing on the theory of joint continuous detection their spontaneous emission. consider a device geometry similar to used well-known Bell state measurements, which we analyze using conceptually transparent model stochastic trajectories; use this review photodetection, most straightforward case, and then generalize diffusive trajectories from homodyne heterodyne as well....

We propose that a quantum black hole can produce new kind of late-time gravitational echoes, facilitated by near-horizon process analogous to Andreev reflection in condensed matter systems. In comparison the traditional echo scenarios where region is treated as an ordinary reflector, we argue that, consequent scattering, this better described reflector. Such interactions lead novel contribution echoes with characteristic phase difference, effect which how reflections propagating particlelike...

We propose a microscopic quantum description for Hawking radiation as Andreev reflections, which resolves the information paradox at black hole event horizons. The detailed analysis presented here reveals how hole, treated an reflecting mirror, provides manifestly unitary of evaporating expanding our previous in [S. K. Manikandan and A. N. Jordan, Phys. Rev. D 96, 124011 (2017), S. 98, 124043 (2018)]. In analogy, by accepting particles---pairing them with infalling quanta into...

We propose an analogy between the quantum physics of a black hole in its late stages evaporation process and superfluid Bose-Einstein condensate (BEC), based on Horowitz Maldacena final-state projection model [J. High Energy Phys. 02 (2004), 008]. The region is considered to be analogous interior hole, normal fluid/superfluid interface compared event horizon hole. theoretically investigate possibility recovering wave function particles incident BEC from fluid, facilitated by mode conversion...

In a recent work we showed that the detection of exchange single graviton between massive quantum resonator and gravitational wave can be achieved. Key to this ability are experimental progress in preparing measuring resonators regime, correlation with independent LIGO detections waves induce stimulated absorption. But do single-graviton processes imply quantization gravity? Here analyze question make historic analogy early days theory. We discuss what ways such experiments indeed probe key...

We investigate the emission characteristics of a measurement-driven quantum emitter in continuously monitored optical environment. The is stimulated by observing Pauli spin along its transition dipole that maximally non-commutes with Hamiltonian emitter. It also exchanges energy resonantly environment, observable as jumps corresponding to absorption or photon and null events where did not make jump. characterize finite-time statistics estimate their covariance precision using large deviation...

Rather than it being a hot mess, Landauer’s principle is easily understood, derivable from basic principles of thermodynamics and statistical physics, in accordance with experimental tests.

The quantization of gravity is widely believed to result in gravitons -- particles discrete energy that form gravitational waves. But their detection has so far been considered impossible. Here we show signatures single graviton exchange can be observed laboratory experiments. We stimulated and spontaneous single-graviton processes become relevant for massive quantum acoustic resonators absorption resolved through continuous sensing jumps. analyze the feasibility observing quanta between...