324 citations · 1.4k across the 18 of their papers we have counts for
18 papers
Entanglement-enhanced phase estimation without prior phase information
G. Colangelo, F. Martin Ciurana, G. Puentes +2
We study the generation of planar quantum squeezed (PQS) states by quantum non-demolition (QND) measurement of a cold ensemble of Rb atoms. Precise calibration of the QND me…
Entanglement-enhanced radio-frequency field detection and waveform sensing
F. Martin Ciurana, G. Colangelo, L. Slodicka +2
We demonstrate a new technique for detecting components of arbitrarily-shaped radio-frequency waveforms based on stroboscopic back-action evading measurements. We combine quantum n…
Quantum non-demolition measurement enables macroscopic Leggett-Garg tests
Costantino Budroni, Giuseppe Vitagliano, Giorgio Colangelo +4
We show how a test of macroscopic realism based on Leggett-Garg inequalities (LGIs) can be performed in a macroscopic system. Using a continuous-variable approach, we consider quan…
Generation of macroscopic singlet states in a cold atomic ensemble
N. Behbood, F. Martin Ciurana, G. Colangelo +4
We report the generation of a macroscopic singlet state in a cold atomic sample via quantum non-demolition (QND) measurement induced spin squeezing. We observe 3 dB of spin squeezi…
Ultrasensitive Atomic Spin Measurements with a Nonlinear Interferometer
R. J. Sewell, M. Napolitano, N. Behbood +3
We study nonlinear interferometry applied to a measurement of atomic spin and demonstrate a sensitivity that cannot be achieved by any linear-optical measurement with the same expe…
Certified quantum non-demolition measurement of a macroscopic material system
R. J. Sewell, M. Napolitano, N. Behbood +2
Quantum non-demolition (QND) measurements improve sensitivity by evading measurement back-action. The technique was first proposed to detect mechanical oscillations in gravity wave…
Efficient quantification of non-Gaussian spin distributions
B. Dubost, M. Koschorreck, M. Napolitano +3
We study theoretically and experimentally the quantification of non-Gaussian distributions via non-destructive measurements. Using the theory of cumulants, their unbiased estimator…
Magnetic sensitivity beyond the projection noise limit by spin squeezing
R. J. Sewell, M. Koschorreck, M. Napolitano +3
We report the generation of spin squeezing and entanglement in a magnetically-sensitive atomic ensemble, and entanglement-enhanced field measurements with this system. A maximal Ra…
Interaction-based quantum metrology showing scaling beyond the Heisenberg limit
M. Napolitano, M. Koschorreck, B. Dubost +3
Quantum metrology studies the use of entanglement and other quantum resources to improve precision measurement. An interferometer using N independent particles to measure a paramet…
QND Measurement of Large-Spin Ensembles by Dynamical Decoupling
M. Koschorreck, M. Napolitano, B. Dubost +1
Quantum non-demolition (QND) measurement of collective variables by off-resonant optical probing has the ability to create entanglement and squeezing in atomic ensembles. Until now…
Measurement of Spin Projection Noise in Broadband Atomic Magnetometry
M. Koschorreck, M. Napolitano, B. Dubost +1
We measure the sensitivity of a broadband atomic magnetometer using quantum non-demolition spin measurements. A cold, dipole-trapped sample of rubidium atoms provides a long-lived…
Generation of macroscopic singlet states in atomic ensembles
Geza Toth, Morgan W. Mitchell
We study squeezing of the spin uncertainties by quantum non-demolition (QND) measurement in non-polarized spin ensembles. Unlike the case of polarized ensembles, the QND measuremen…
Detecting Hidden Differences via Permutation Symmetries
R. B. A. Adamson, P. S. Turner, M. W. Mitchell +1
We present a method for describing and characterizing the state of N particles that may be distinguishable in principle but not in practice due to experimental limitations. The tec…
Entangled photon apparatus for the undergraduate laboratory
Dietrich Dehlinger, M. W. Mitchell
We present detailed instructions for constructing and operating an apparatus to produce and detect polarization-entangled photons. The source operates by type-I spontaneous paramet…
Entangled photons, nonlocality and Bell inequalities in the undergraduate laboratory
Dietrich Dehlinger, M. W. Mitchell
We use polarization-entangled photon pairs to demonstrate quantum nonlocality in an experiment suitable for advanced undergraduates. The photons are produced by spontaneous paramet…
Dynamics of Atom-Mediated Photon-Photon Scattering I: Theory
M. W. Mitchell, R. Y. Chiao
The mediated photon-photon interaction due to the resonant Kerr nonlinearity in an inhomogeneously broadened atomic vapor is considered. The time-scale for photon-photon scattering…
Ground State Quantum Computation
Ari Mizel, M. W. Mitchell, Marvin L. Cohen
We formulate a novel ground state quantum computation approach that requires no unitary evolution of qubits in time: the qubits are fixed in stationary states of the Hamiltonian. T…
Superluminal Signals: Causal Loop Paradoxes Revisited
J. C. Garrison, M. W. Mitchell, R. Y. Chiao +1
Recent results demonstrating superluminal group velocities and tachyonic dispersion relations reopen the question of superluminal signals and causal loop paradoxes. The sense in wh…