I think this may be what you're looking for.

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Note added at 3 days22 hrs (2009-09-07 08:15:36 GMT) Post-grading
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In response to Per's disagree: If you read further down in the same ref, it reads:
"In accordance with Clause 1.11 of your contract, you are hereby placed on garden leave for the remainder of your notice period. During this period, you are not permitted to work for any other person, firm, client, corporation or on your own behalf without the Company's prior written permission. You will continue to receive your contractual pay and benefits during this notice period and whilst you remain on garden leave.

Furthermore, in accordance with Clause 1.13 of your contract, the Company hereby notifies you that with effect from the end of your notice period, you will be placed on a further quarantine period, up to a maximum of 12 month." Note the phrase "*further quarantine period*". The purpose of GL is not only to protect a company from angry employees, but also to prevent them from going over to work for a direct competitor.

Here's another definition: "The term, “garden leave injunction”, is generally used to describe the range of orders which a
Court may make to protect an employer when an employee is seeking to leave to join a competitor. Used in its purest sense, it describes the situation where the Court makes an order effectively putting an employee into quarantine for the whole or some part of the period of notice due under the contract."

In short, I would say that "garden Leave" is a euphemistic term for quarantine.

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Note added at 3 days22 hrs (2009-09-07 08:40:35 GMT) Post-grading
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Having said the above, I do agree that your term, "lønnet arbeid" would be a more appropriate solution here, Per. Having looked at this again, I think "karantene" is too blatant here.