Research in QPC team

Scientific Highlights:

• Observing the progressive many-body screening of a Kondo impurity, using charge states to implement a pseudospin and a capacitively coupled charge detector to measure it (Nature Communications, 2023).
• Probing the anyon statistics with cross-correlations, of pi/3 and 3pi/5 fractional quantum Hall anyons (Phys. Rev. X, 2023).
• Andreev-like scattering of a fractional quasiparticle, into a transmitted quasielectron and a fractional quasihole (Nature Communications, 2023).
• Electronic heat flow and thermal shot noise in quantum circuits. Beyond electrical conductance, we observed the flow of heat and shot noise in response to a temperature difference in a composite quantum  circuit (Nature Communications, 2019).
• Transmitting the quantum state of electrons with Coulomb interaction, across a metallic island that individual electrons could not traverse during their quantum lifetime (Science, 2019).
• Macroscopic (0.25mm) electron quantum coherence in a solid-state circuit, achieved through nano-circuit engineering along the quantum Hall edge channels (Phys. Rev. X, 2019).
• Analog quantum simulation at the threshold of quantum supremacy, using a quantum circuit to emulate a Luttinger liquid with a single impurity (Phys. Rev. X, 2018).
• Tunable quantum criticality and super-ballistic transport explored in a 'charge' Kondo circuit (Science, 2018).
• Heat Coulomb blockade of one ballistic channel. Coulomb interaction influences heat and electricity profoundly differently, beyond the widespread Wiedemann-Franz law paradigm (Nature Physics, 2018).
• Controlling charge quantization with quantum fluctuations, in a metallic circuit node (Nature, 2016).
• Observation of the 'charge' Kondo effect. The Kondo effect, a test-bed for the strongly-correlated electron physics, also applies to the macroscopic quantum degrees of freedom of electrical circuits (Nature, 2015).
• Measurement of the quantum limit of heat flow across a single electronic channel. Heating drives the transition toward a classical description, but heat transport itself is ruled by quantum mechanics (Science, 2013).
• Quantum back-action of dissipative circuits on the conductance of an arbitrary electronic channel, a phenomenon with quantum engineering implications for the future of nanoelectronic (Nature Physics, 2011).
• Out-of-equilibrium spectroscopy of the electronic distribution function in a 1D conductor, the quantum Hall channel (Nature Physics, 2010).

Technical Highlights:

• 6 mK temperature for the electrons in quantum circuits, a record for small devices (Nature Communications, 2016).
• Noise is the signal, with a ultra-high resolution on current noise (5 10^-32 A²/Hz, current state of the art).

Research Lines:

1. Many-body quantum physics
2. Heat quantum transport

List of the team's publications.