A Coherent Beam Splitter for Electronic Spin States

Petta, J. R.; Lü, Hong; Gossard, A. C.

doi:10.1126/science.1183628

Cited by 266 publications

(346 citation statements)

References 30 publications

Supporting

Mentioning

329

Contrasting

Order By: Relevance

“…Of special interest in this field is the case of a DQD occupied with two electrons [4,5]. Transitions between the spin states of the two electrons have been realized using the exchange interaction [6] or Landau-Zener processes [7]. Interestingly, the spin of an electron can also be flipped by letting the electron tunnel from one dot to another in the presence of a magnetic field gradient or finite spin-orbit interaction.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of spin-flip photon-assisted tunneling

et al. 2014

View full text Add to dashboard Cite

We present time-resolved measurements of spin-flip photon-assisted tunneling and spin-flip relaxation in a doubly occupied double quantum dot. The photon-assisted excitation rate as a function of magnetic field indicates that spin-orbit coupling is the dominant mechanism behind the spin-flip under the present conditions. We are able to extract the resulting effective "spin-flip tunneling" energy, which is found to be three orders of magnitude smaller than the regular spin-conserving tunneling energy. We also measure the relaxation and dephasing times of a qubit formed out of two two-electron states with different spin and charge configurations.

show abstract

Section: Introductionmentioning

confidence: 99%

Dynamics of spin-flip photon-assisted tunneling

et al. 2014

View full text Add to dashboard Cite

show abstract

“…1 In parallel, the electrical and optical manipulation of the spin states of single carriers in QDs has made unprecedented control over quantum states in the condensed matter possible. 2,3 Single spin manipulations and quantum optics with single photons are directly related to the optical selection rules. 4 The band structure given by the symmetry and strength of the carrier confinement potentials defined, e.g., by the dot shape and its chemical composition plays a crucial role in defining the exact carrier spin state and, correspondingly, the polarization of the emitted and absorbed photons.…”

Section: Introductionmentioning

confidence: 99%

Magnetic field induced valence band mixing in [111] grown semiconductor quantum dots

Durnev¹,

Glazov²,

Ivchenko³

et al. 2013

Phys. Rev. B

View full text Add to dashboard Cite

We present a microscopic theory of the magnetic field induced mixing of heavy-hole states ±3/2 in GaAs droplet dots grown on (111)A substrates. The proposed theoretical model takes into account the striking dot shape with trigonal symmetry revealed in atomic force microscopy. Our calculations of the hole states are carried out within the Luttinger Hamiltonian formalism, supplemented with allowance for the triangularity of the confining potential. They are in quantitative agreement with the experimentally observed polarization selection rules, emission line intensities and energy splittings in both longitudinal and transverse magnetic fields for neutral and charged excitons in all measured single dots.

show abstract

“…In solid-state physics, LZ transitions have been used as a beam splitter for manipulating a superconducting qubit with MachZehnder interferometry [20], for coherent control of a qubit system [21], and again as a beam splitter for electronic spin states [22]. They have been used to develop quantum memory in diamond nitrogen-vacancy centers [23].…”

Section: Introductionmentioning

confidence: 99%

Quantum interference in the field ionization of Rydberg atoms

et al. 2015

View full text Add to dashboard Cite

We excite ultracold rubidium atoms in a magneto-optical trap to a coherent superposition of the three |m j | sublevels of the 37d 5/2 Rydberg state. After some delay, during which the relative phases of the superposition components can evolve, we apply an electric field pulse to ionize the Rydberg electron and send it to a detector. The electron traverses many avoided crossings in the Stark levels as it ionizes. The net effect of the transitions at these crossings is to mix the amplitudes of the initial superposition into the same final states at ionization. Similar to a Mach-Zehnder interferometer, the three initial superposition components have multiple paths by which they can arrive at ionization and, since the phases of those paths differ, we observe quantum beats as a function of the delay time between excitation and initiation of the ionization pulse. We present a fully quantum-mechanical calculation of the electron's path to ionization and the resulting interference pattern.

show abstract

A Coherent Beam Splitter for Electronic Spin States

Cited by 266 publications

References 30 publications

Dynamics of spin-flip photon-assisted tunneling

Dynamics of spin-flip photon-assisted tunneling

Magnetic field induced valence band mixing in [111] grown semiconductor quantum dots

Quantum interference in the field ionization of Rydberg atoms

Contact Info

Product

Resources

About