Controlling the spontaneous emission of a superconducting transmon qubit.
نویسندگان
چکیده
We present a detailed characterization of coherence in seven transmon qubits in a circuit QED architecture. We find that spontaneous emission rates are strongly influenced by far off-resonant modes of the cavity and can be understood within a semiclassical circuit model. A careful analysis of the spontaneous qubit decay into a microwave transmission-line cavity can accurately predict the qubit lifetimes over 2 orders of magnitude in time and more than an octave in frequency. Coherence times T1 and T_{2};{*} of more than a microsecond are reproducibly demonstrated.
منابع مشابه
Corrigendum: Light-matter decoupling and A2 term detection in superconducting circuits
The spontaneous and stimulated emission of a superconducting qubit in the presence of propagating microwaves originates from an effective light-matter interaction that, similarly to the case of the atomic case, can contain a diamagnetic term proportional to the square vector potential A(2). In the present work we prove that an increase in the strength of the diamagnetic term leads to an effecti...
متن کاملThe Properties and Light-Matter Interaction of a Superconducting Majorana-Transmon Qubit
We analyse the transmon regime Hamiltonian of a Cooper-Pair-Box where the superconducting phase difference is coupled to the zero energy parity states that arise from Majorana quasi-particles. We investigate the level structure and properties of the transmon qubit in this regime where even a small coupling causes hybridization of different transmon-parity states without compromising the suppres...
متن کاملar X iv : 1 70 5 . 01 68 7 v 1 [ qu an t - ph ] 4 M ay 2 01 7 Reverse isolation and backaction of the SLUG microwave amplifier
An ideal preamplifier for qubit measurement must not only provide high gain and near quantumlimited noise performance, but also isolate the delicate quantum circuit from noisy downstream measurement stages while producing negligible backaction. Here we use a Superconducting Lowinductance Undulatory Galvanometer (SLUG) microwave amplifier to read out a superconducting transmon qubit, and we char...
متن کاملRelaxation and frequency shifts induced by quasiparticles in superconducting qubits
As low-loss nonlinear elements, Josephson junctions are the building blocks of superconducting qubits. The interaction of the qubit degree of freedom with the quasiparticles tunneling through the junction represents an intrinsic relaxation mechanism. We develop a general theory for the qubit decay rate induced by quasiparticles, and we study its dependence on the magnetic flux used to tune the ...
متن کاملOrigin and implications of an A2-like contribution in the quantization of circuit-QED systems
By placing an atom into a cavity, the electromagnetic mode structure of the cavity is modified. In cavity QED, one manifestation of this phenomenon is the appearance of a gauge-dependent diamagnetic term, known as the A2 contribution. Although in atomic cavity QED, the resulting modification in the eigenmodes is negligible, in recent superconducting circuit realizations, such corrections can be...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
- Physical review letters
دوره 101 8 شماره
صفحات -
تاریخ انتشار 2008