Energy Relaxation Time between Macroscopic Quantum Levels in a Superconducting Persistent Current Qubit
arXiv:cond-mat/0311289 · doi:10.1103/PhysRevLett.92.117904
Abstract
We measured the intrawell energy relaxation time τ_{d} between macroscopic quantum levels in the double well potential of a Nb persistent-current qubit. Interwell population transitions were generated by irradiating the qubit with microwaves. Zero population in the initial well was then observed due to a multi-level decay process in which the initial population relaxed to the lower energy levels during transitions. The qubit's decoherence time, determined from τ_{d}, is longer than 20 microseconds, holding the promise of building a quantum computer with Nb-based superconducting qubits.
18 pages, 5 figures
References in corpus (7)
- Quantum state engineering with Josephson-junction devices
- Coherent control of macroscopic quantum states in a single-Cooper-pair box
- Manipulating the Quantum State of an Electrical Circuit
- Coherent Quantum Dynamics of a Superconducting Flux Qubit
- A Superconducting Persistent Current Qubit
- Quantum oscillations in two coupled charge qubits
- Impact of time-ordered measurements of the two states in a niobium superconducting qubit structure
Cited by in corpus (17)
- Optical selection rules and phase-dependent adiabatic state control in a superconducting quantum circuit
- A n-qubit controlled phase gate with superconducting quantum interference devices coupled to a resonator
- Realization of an n-qubit controlled-U gate with superconducting quantum interference devices or atoms in cavity QED
- Probing Decoherence with Electromagnetically Induced Transparency in Superconductive Quantum Circuits
- Heralded quantum controlled phase gates with dissipative dynamics in macroscopically-distant resonators
- Electromagnetically induced transparency in superconducting quantum circuits : Effects of decoherence, tunneling and multi-level cross-talk
- Fidelity and quantum chaos in the mesoscopic device for the Josephson flux qubit
- Intrinsic leakage of the Josephson flux qubit and breakdown of the two-level approximation for strong driving
- Large Amplitude Harmonic Driving of Highly Coherent Flux Qubits
- Macroscopic tunnel splittings in superconducting phase qubits
- Quantum controlled phase gate and cluster states generation via two superconducting quantum interference devices in a cavity
- Robust creation of entangled states of two coupled flux qubits via dynamic control of the transition frequencies
- Detection of Geometric Phases in Flux Qubits with Coherent Pulses
- DC measurements of macroscopic quantum levels in a superconducting qubit structure with a time-ordered meter
- Quantum chaos in the mesoscopic device for the Josephson flux qubit
- Asymmetry Control in a Parametric Oscillator for the Quantum Simulation of Chemical Activation
- Ultrastrong Coupling of a Qubit with a Nonlinear Optical Resonator