Macroscopic tunnel splittings in superconducting phase qubits

Abstract

Prototype Josephson-junction based qubit coherence times are too short for quantum computing. Recent experiments probing superconducting phase qubits have revealed previously unseen fine splittings in the transition energy spectra. These splittings have been attributed to new microscopic degrees of freedom (microresonators), a previously unknown source of decoherence. We show that macroscopic resonant tunneling in the extremely asymmetric double well potential of the phase qubit can have observational consequences that are strikingly similar to the observed data.

4 pages (3 figures); accepted version

References in corpus (17)

• Circuit Quantum Electrodynamics: Coherent Coupling of a Single Photon to a Cooper Pair Box
• Manipulating the Quantum State of an Electrical Circuit
• Coherent Quantum Dynamics of a Superconducting Flux Qubit
• Quantum oscillations in two coupled charge qubits
• Demonstration of conditional gate operation using superconducting charge qubits
• Decoherence in Josephson Qubits from Junction Resonances
• Observation of quantum oscillations between a Josephson phase qubit and a microscopic resonator using fast readout
• Quantum logic gates for coupled superconducting phase qubits
• Decoherence in Josephson-junction qubits due to critical current fluctuations
• Evidence for entangled states of two coupled flux qubits
• Tunnel splittings for one dimensional potential wells revisited
• Spectroscopy of Three-Particle Entanglement in a Macroscopic Superconducting Circuit
• Energy Relaxation Time between Macroscopic Quantum Levels in a Superconducting Persistent Current Qubit
• Macroscopic resonant tunneling of magnetic flux
• Reduced Visibility of Rabi Oscillations in Superconducting Qubits
• DC measurements of macroscopic quantum levels in a superconducting qubit structure with a time-ordered meter
• Projective Measurement Scheme for Solid-State Qubits

Cited by in corpus (15)

• 1/f noise: implications for solid-state quantum information
• Generation of GHZ entangled states of photons in multiple cavities via a superconducting qutrit or an atom through resonant interaction
• Quantum phase-slips in Josephson junction rings
• Decoherence, Autler-Townes effect, and dark states in two-tone driving of a three-level superconducting system
• Electromagnetically induced transparency in superconducting quantum circuits : Effects of decoherence, tunneling and multi-level cross-talk
• Tunneling Spectroscopy of Two-level Systems Inside Josephson Junction
• Quantum confinement in an asymmetric double-well potential through energy analysis and information entropic measure
• Bound states in a hyperbolic asymmetric double-well
• Semi-classical formula for quantum tunneling in asymmetric double-well potentials
• Microscopic model of critical current noise in Josephson-junction qubits: Subgap resonances and Andreev bound states
• Theory of measurement crosstalk in superconducting phase qubits
• Entanglement of a qubit coupled to a resonator in the adiabatic regime
• Analysis of measurement errors for a superconducting phase qubit
• Quantum state engineering with flux-biased Josephson phase qubits by Stark-chirped rapid adiabatic passages
• Diagonalizing the Hamiltonian of capacitively coupled superconducting phase qubits