document

Probing Dynamics of an Electron-Spin Ensemble via a Superconducting Resonator

Ranjan, V. (author), De Lange, G. (author), Schutjens, R. (author), Debelhoir, T. (author), Groen, J.P. (author), Szombati, D. (author), Thoen, D.J. (author), Klapwijk, T.M. (author), Hanson, R. (author), DiCarlo, L. (author)

We study spin relaxation and diffusion in an electron-spin ensemble of nitrogen impurities in diamond at low temperature (0.25–1.2 K) and polarizing magnetic field (80–300 mT). Measurements exploit field-controlled coupling of the ensemble to two modes of a transmission-line resonator. The observed temperature-independent spin relaxation time...

journal article 2013

document

Detection and Control of Individual Nuclear Spins Using a Weakly Coupled Electron Spin

Taminiau, T.H. (author), Wagenaar, J.J.T. (author), Van der Sar, T. (author), Jelezko, F. (author), Dobrovitski, V.V. (author), Hanson, R. (author)

We experimentally isolate, characterize, and coherently control up to six individual nuclear spins that are weakly coupled to an electron spin in diamond. Our method employs multipulse sequences on the electron spin that resonantly amplify the interaction with a selected nuclear spin and at the same time dynamically suppress decoherence caused...

journal article 2012

document

Comparison of dynamical decoupling protocols for a nitrogen-vacancy center in diamond

Wang, Z.H. (author), De Lange, G. (author), Riste, D. (author), Hanson, R. (author), Dobrovitski, V.V. (author)

We perform a detailed theoretical-experimental study of the dynamical decoupling (DD) of the nitrogen-vacancy (NV) center in diamond. We investigate the DD sequences applied to suppress the dephasing of the electron spin of the NV center induced by the coupling to a spin bath composed of the substitutional nitrogen atoms. The decoupling...

journal article 2012

document

Two-Photon Quantum Interference from Separate Nitrogen Vacancy Centers in Diamond

Bernien, H. (author), Childress, L. (author), Robledo, L. (author), Markham, M. (author), Twitchen, D. (author), Hanson, R. (author)

We report on the observation of quantum interference of the emission from two separate nitrogen vacancy (NV) centers in diamond. Taking advantage of optically induced spin polarization in combination with polarization filtering, we isolate a single transition within the zero-phonon line of the nonresonantly excited NV centers. The time-resolved...

journal article 2012

document

Charge-State Conditional Operation of a Spin Qubit

Van Weperen, I. (author), Armstrong, B.D. (author), Laird, E.A. (author), Medford, J. (author), Marcus, C.M. (author), Hanson, M.P. (author), Gossard, A.C. (author)

We report coherent operation of a singlet-triplet qubit controlled by the spatial arrangement of two confined electrons in an adjacent double quantum dot that is electrostatically coupled to the qubit. This four-dot system is the specific device geometry needed for two-qubit operations of a two-electron spin qubit. We extract the strength of the...

journal article 2011

document

Single-Spin Magnetometry with Multipulse Sensing Sequences

De Lange, G. (author), Ristè, D. (author), Dobrovitski, V.V. (author), Hanson, R. (author)

We experimentally demonstrate single-spin magnetometry with multipulse sensing sequences. The use of multipulse sequences can greatly increase the sensing time per measurement shot, resulting in enhanced ac magnetic field sensitivity. We theoretically derive and experimentally verify the optimal number of sensing cycles, for which the effects of...

journal article 2011

document

Control and Coherence of the Optical Transition of Single Nitrogen Vacancy Centers in Diamond

Robledo, L.M. (author), Bernien, H. (author), Van Weperen, I. (author), Hanson, R. (author)

We demonstrate coherent control of the optical transition of single nitrogen-vacancy defect centers in diamond. On applying short resonant laser pulses, we observe optical Rabi oscillations with a half period as short as 1 ns, an order of magnitude shorter than the spontaneous emission time. By studying the decay of Rabi oscillations, we find...

journal article 2010

document

Bootstrap Tomography of the Pulses for Quantum Control

Dobrovitski, V.V. (author), De Lange, G. (author), Ristè, D. (author), Hanson, R. (author)

Long-time dynamical decoupling and quantum control of qubits require high-precision control pulses. Full characterization (quantum tomography) of imperfect pulses presents a bootstrap problem: tomography requires initial states of a qubit which cannot be prepared without perfect pulses. We present a protocol for pulse error analysis,...

journal article 2010

document

Decay of Rabi Oscillations by Dipolar-Coupled Dynamical Spin Environments

Dobrovitski, V.V. (author), Feiguin, A.E. (author), Hanson, R. (author), Awschalom, D.D. (author)

We study the Rabi oscillations decay of a spin decohered by a spin bath whose internal dynamics is caused by dipolar coupling between the bath spins. The form and rate of decay as a function of the intrabath coupling is obtained analytically, and confirmed numerically. The complex form of decay smoothly varies from power law to exponential, and...

journal article 2009

document

Excited-State Spectroscopy Using Single Spin Manipulation in Diamond

Fuchs, G.D. (author), Dobrovitski, V.V. (author), Hanson, R. (author), Batra, A. (author), Weis, C.D. (author), Schenkel, T. (author), Awschalom, D.D. (author)

We use single-spin resonant spectroscopy to study the spin structure in the orbital excited state of a diamond nitrogen-vacancy (N-V) center at room temperature. The data show that the excited-state spin levels have a zero-field splitting that is approximately half of the value of the ground state levels, a g factor similar to the ground state...

journal article 2008

document

Quenching Spin Decoherence in Diamond through Spin Bath Polarization

Takahashi, S. (author), Hanson, R. (author), Van Tol, J. (author), Sherwin, M.S. (author), Awschalom, D.D. (author)

We experimentally demonstrate that the decoherence of a spin by a spin bath can be completely eliminated by fully polarizing the spin bath. We use electron paramagnetic resonance at 240 GHz and 8 T to study the electron-spin coherence time T2 of nitrogen-vacancy centers and nitrogen impurities in diamond from room temperature down to 1.3 K. A...

journal article 2008

document

Decoherence dynamics of a single spin versus spin ensemble

Dobrovitski, V.V. (author), Feiguin, A.E. (author), Awschalom, D.D. (author), Hanson, R. (author)

We study decoherence of central spins by a spin bath, focusing on the difference between measurement of a single central spin and measurement of a large number of central spins (as found in typical spin-resonance experiments). For a dilute spin bath, the single spin demonstrates Gaussian free-induction decay, in contrast to exponential decay...

journal article 2008

document

Experimental signature of phonon-mediated spin relaxation in a two-electron quantum dot

Meunier, T. (author), Vink, I.T. (author), Willems van Beveren, L.H. (author), Tielrooij, K.J. (author), Hanson, R. (author), Koppens, F.H.L. (author), Tranitz, H.P. (author), Wegscheider, W. (author), Kouwenhoven, L.P. (author), Vandersypen, L.M.K. (author)

journal article 2007

document

Spins in few-electron quantum dots

Hanson, R. (author), Kouwenhoven, L.P. (author), Petta, J.R. (author), Tarucha, S. (author), Vandersypen, L.M.K. (author)

journal article 2007

document

Single-shot readout of electron spin states in a quantum dot using spin-dependent tunnel rates

Hanson, R. (author), van Beveren, L.H.W. (author), Vink, I.T. (author), Elzerman, J.M. (author), Naber, W.J.M. (author), Koppens, F.H.L. (author), Kouwenhoven, L.P. (author), Vandersypen, L.M.K. (author)

journal article 2005

document

Semiconductor few-electron quantum dot operated as a bipolar spin filter

Hanson, R. (author), Vandersypen, L.M.K. (author), van Beveren, L.M.W, (author), Elzerman, J.M. (author), Vink, I.T. (author), Kouwenhoven, L.P. (author)

journal article 2004

document

Single-electron charging and detection in a laterally coupled quantum-dot circuit in the few-electron regime

Zhang, L.X. (author), Matagne, P. (author), Leburton, J.P. (author), Hanson, R. (author), Kouwenhoven, L.P. (author)

journal article 2004

document

Measurement Efficiency and n-Shot Readout of Spin Qubits

Engel, H.A. (author), Golovach, V.N. (author), Loss, D. (author), Vandersypen, L.M.K. (author), Elzerman, J.M. (author), Hanson, R. (author), Kouwenhoven, L.P. (author)

journal article 2004

document

Few-electron quantum dot circuit with integrated charge read out

Elzerman, J.M. (author), Hanson, R. (author), Greidanus, J.S. (author), Willems van Beveren, L.H. (author), De Franceschi, S. (author), Vandersypen, L.M.K. (author), Tarucha, S. (author), Kouwenhoven, L.P. (author)

journal article 2003

document

Zeeman Energy and Spin Relaxation in a One-Electron Quantum Dot

Hanson, R. (author), Witkamp, B. (author), Vandersypen, L.M.K. (author), van Beveren, L.H.W. (author), Elzerman, J.M. (author), Kouwenhoven, L.P. (author)

journal article 2003